31 March, rating PG
The main character, Hiccup, is played by Jay Baruchel, who isn't very well known. But you might recognise him from the second Night at the Museum film.
The big Hollywood names here are Gerard Butler, who plays Hiccup's dad, and his feisty friend Astrid, voiced by America Ferrera.
Listen out for David Tennant's voice in this movie too, he has a small part as a Viking called Spitelout!
Hiccup is a Viking and lives on an island which is terrorised by fire-breathing dragons, who steal their food and try to burn down the village whenever they get the chance.
As the son of a Viking chief, Hiccup is expected to hunt and kill dragons too. But he can't face the idea of killing any creature, even scary fire-breathing ones.
Viking chief Stoick's impressive beard!
Hiccup's world is turned upside down when he accidently captures a Night Fury, a dragon which is so fast and so furious that no Viking has ever seen one up close.
Rather than slaying the dragon, he and Hiccup become friends and he learns that dragons can be trained rather than killed.
But what will his dad say when he finds out that Hiccup has been hiding a dangerous dragon?
The scenes where Hiccup is flying through the air on his dragon Toothless are incredible. It feels like you're on a rollercoaster, not at the cinema!
Hiccup and his pet dragon Toothless
The best part of the film is when Hiccup is training Toothless to fly using a homemade tail. It's hilarious to watch the pair become close friends as they try some literally hit-and-miss flying techniques!
The soundtrack is also worth a mention. The music in the film works perfectly with the story and a lot of the tracks have been specially written for the film.
Toothless the dragon is a brilliant character. He might be a fire-breathing monster but he acts like a mix between a cat and Stitch from the Lilo and Stitch films.
Any scenes with Hiccup and Toothless really stand out as they have the most fun!
Any weak bits?
The Vikings all have Scottish accents, which is really weird and does get annoying after a while!
The plot isn't bad but there's nothing new here. You'll probably be able to guess how it's going to end, and the film probably relies too much on the dragons to make it different from other kids movies.
Hit or miss?
Probably a hit. It's not as good as Dreamworks' other films, like Shrek or Madagascar, but the characters are very sweet and the dragons do help keep things interesting.
Let us know what you thought of it! Send your reviews using the form in the top right of the page.
"How To Train Your Dragon is amazing, 5 star rating. It tells you how people used to believe that dragons lived on Earth."
Ben, 9, Glasgow, Scotland
"I loved it. The Scottish accents weren't annoying!"
Alice, 12, Aberdeen, Scotland
"It is very funny and a very good film to watch."
Omarnawar, 9, London, England
"I loved this film, my best friend and I saw it. Toothless was so cute but it was kind of predictable."
Samantha, 12, London, England
"Awesome! I recommend it for age five and up. I love it so much. Hiccup is awesome. 5 out of 5."
Millie, 9, London, England
"This film was fantastic but bit sad though! Go Hiccup!"
Olivia, 10, Hertfordshire, England
"I think How To Train Your Dragon is an exciting and good animation film for children my age."
Brandon, 7, Nottinghamshire, England
"I loved the film. It was the best film ever in the universe that I have ever seen. I'd give it 100 out of 10! I was really excited when I saw it was coming out in cinema."
Thomas, 9, Herefordshire, England
"I read the book this film is based on and saw the movie. It was really good. Dreamworks, please make a sequel of this!"
Aneesa, 11, Oxford, England
"I was disappointed because it was nothing like the books and I think the books were much better and would have made it a better film."
Sam, 13, Cornwall, England
"I went to see How To Train Your Dragon and it was really good, certainly a hit but MUCH better in 3D."
Lara, 10, Renfrewshire, Scotland
"I think it's absolutely rubbish!"
Ellie, 10, County Galway, Ireland
"I think How To Train Your Dragon was really good because it made me laugh."
Alice, 6, England
"I totally adored this film, it was amazing! Go Dragons!"
Poppy, 13, Kent, England
"I love this film. I thought it would be very babyish but it was so captivating and dramatic."
Erin, 12, Glasgow, Scotland
"I think it is the best film in the whole world. Most films are about killing dragons, but this one is about saving dragons. Finally someone gets it. It's a great family film to see. I would rate it 1,000,000 stars!"
Ffion, 10, Swansea, Wales
"I thought How To Train Your Dragon was brilliant! It was fun and packed with action, although there were some weaknesses. I would recommend anyone of any age to go see it!! Toothless is so cute."
Amalie, 11, Luton, England
"I loved it!! I would give it a 100000 out of 100000!! TOOTHLESS IS SOOOOO CUTE!!"
Abigail, 8, Devon, England
"It was good, but nothing like the books! I have got all of them. The film could have been a prequel."
Jacob, 10, Manchester, England
"I thought this film was great! I especially like Toothless, and even though it's a dumb name, he is still REALLY CUTE!!"
Amber, 11, Luton, England
"It is really good and I think it should get some Oscars for the special effects!"
Callum, 11, Cumbria, England
"I felt this was a superb film and would love to see it again in 3D. I also felt that sometimes it was a bit dark and couldn't see what was going on, but apart from that it was very good and I would rate it 7 out of 10."
Elysia, 11, Luton, England
"I loved How To Train Your Dragon. It was action packed, really exciting and very funny."
Craig, 11, South Ayrshire, Scotland
"I watched it twice, once in 3D and once in 2D. 3D was a lot better. I think that the dragons are really cute. It was funny as well."
Kate, 12, West Sussex, England
"One of my favourite films- 100 out of 100. I have read all of the books and still think it's just as good as the books. You should really watch it. The books are also my favourite. You should read them even though they are completely different from the film."
Rohan, 11, Milton Keynes, England
"I loved it, my mum loved it and my brother loved. It is great!"
Jack, 9, County Down, N. Ireland
"This is the best film I have ever seen! It's well and truly amazing. I would give it 20 stars!"
Julie, 11, London, England
"The graphics and 3D effects are WAY better than Avatar. I think Toothless is REALLY CUTE!"
Emam, 11, Hong Kong
"I love it, great movie with a lot of skill."
Ella, 9, New Zealand
"I think that How To Train Your Dragon is a great film but the downside was that it wasn't very funny."
Ciara, 10, Berkshire, England
"I thought this was absolutely rubbish. It is nothing like the books."
Kesia, 14, Randstad, Netherlands
"It's OK but nothing like the book. The images are cool though."
Claire, 13, West Sussex, England
"I loved How To Train Your Dragon. It was so sweet and it had really good animation. It was so cool in 3D."
Amber, 11, London, England
"It is great. I could watch it again and again."
Anna, 9, Cornwall, England
"To be honest with you it was total nonsense but my little sister enjoyed it."
Rhonda, 12, Hertfordshire, England
"Best movie in the whole world, LOVE IT! The dragon is so CUTE."
Kemina, 10, London, England
"I think this movie is boring and terrible. Why is the dragon called Toothless? That's a dumb name!"
Lorna, 10, London, England
"Everyone gave it 10/10 but it wasn't even 5/10 for me. Boring, really predictable, so over all it's just OK."
Caitlin, 10, Plymouth, England
"Very, very cool film especially in 3D. Good for any age."
Emily, 10, North Yorkshire, England
"How to Train your Dragon is amazing! I would definitely go to see it again!"
Amy, 10, London, England
"When I went to see it, I was really excited because I had seen the advert on the TV. I was also excited because I had read most of the books which are my favourites. It is one of the best films I have EVER seen and that is a fact! Even if I hadn't read the books it would still be my favourite."
Emily, 9, Staffordshire, England
"It is an amazing film that was really moving but made me laugh all the way through!"
Katie, 10, Bridgend, Wales
"It was very funny but also scary. I loved it."
Jessica, 9, Northamptonshire, England
"The film was brilliant, I loved it."
Bryn, 10, Norfolk, England
"How To Train Your Dragon was a great movie with an interesting plot. I don't think they needed to make it 3D because they didn't make much use of it in the end. Plus it is totally different from the book. If I hadn't read the books though it would have been a good movie."
Ellen, 12, London, England
"I went to see this film in the Easter holidays, it was great! Toothless is the cutest dragon ever and the characters are brilliantly made!"
Adam, 9, Sunderland, England
"I liked this movie because it's not what you would expect and also I loved watching it in 3D. Although it is a good film I think they could have improved it!"
Beth, 11, England
"I loved the film but I think that everyone should agree with me when I say that the Vikings' accents are so annoying."
Nataya, 10, Manchester, England
"I loved this movie! Toothless is so cute!"
Sera, 10, North Carolina, USA
"The film is way better than the books! I loved it, it's funny, it's adventurous, it's a must see film! I watched it in 3D and I jumped right out of my seat! It's a fab film, FIVE STARS!"
Sara, 10, London, England
"A must see film! 10 out of 10. Well done to Jay Baruchel, who was brilliant as Hiccup."
Alex, 9, Surrey, England
"I think it is a brilliant film. My favourite character is Toothless. I thought it was really good in 3D."
Charlie, 8, Staffordshire, England
"How To Train Your Dragon is the best film of the year so far!"
James, 10, Dubai, UAE
"This was the best film ever. It was so funny!"
Beatrice, 10, London, England
"It was great! I loved the ending! 5 stars from me, of course!"
Amie, 11, Hertfordshire, England
"This film is well and truly amazing! The special effects are absolutely thrilling in 3D. It is definitely my favourite film. It is a great film for all the family. 10 stars!"
Clarice, 8, London, England
"Everyone at school says that it is the best and I've seen it and it is amazing."
Amy, 10, Aberdeenshire, England
"I think it is a really good movie."
Ella, 7, Suffolk, England
"I've watched this film in 3D, it was awesome!"
Nivethan, 10, London, England
"I would give this movie ten stars as it was great. This is a movie I could watch several times and not get bored of."
Salma, 12, Birmingham, England
"The film rocks. I never expected it to be that amazing. All the dragons are so cute! My friend and I went to see it and we both love Toothless."
Eve, 9, Edinburgh, Scotland
"How To Train Your Dragon should win an Oscar! It's really great and made my heart leap."
Ysabel, 9, London, England
"The film is nowhere near as good as the book! Toothless is supposed to be only the size of your arm and he is not black. Hiccup's friend is actually called Fishlegs and he is not feisty, he is weedy and has asthma. Do not see this film!"
Priya, 12, West Yorkshire, England
"We went to see How To Train Your Dragon last week and it was brilliant! The character designs and the animation were fantastic and Toothless is one of the cutest dragons ever! The film itself was funny, moving and the 3D was excellent. It has to be one of the best dragon films ever made! 10/10."
Danielle & Sophie, 14, Bournemouth, England
"It was rubbish, soooo cheesy and pointless!! I wouldn't recommend it, but that's just my opinion!"
Lauren, 14, Liverpool, England
"It is a very, very, good film. I would advise going to see it!"
Owen, 10, Coventry, England
"It was brilliant and the 3D made it better!!"
Ashliya, 9, Rochester, England
"I thought it was fantastic! 10/10!"
Saim, 11, London, England
"It is a great movie. The storyline is great and the scenes are too!"
Alex, 9, Liverpool, England
"Great film, a bit sad though. It is so funny!"
Tamara, 10, Manchester, England
"You have to see this film! It's SO great. I saw it in 3D and it is AMAZING. I love Toothless the dragon, he's so sweet! Five stars!"
Emily, 10, Shropshire, England
"It was brilliant and some of the dragons are really cute!"
Lia, 10, Cork, Ireland
"Awful! I hated it sooooo much, I went to sleep halfway through it. 2/10."
Alice, 9, West Midlands, England
"I think this was an amazing film. I loved Toothless, he was so cute!!! All of it is fantastic! Who cares if the Vikings speak in Scottish accents?! It didn't bother me! I couldn't guess how it would end and it was one of the best films ever. I would give it 6 out of 5!!"
Amber, 10, Warwickshire, England
"How To Train Your Dragon is amazing! The special effects are spectacular in 3D!"
Jack, 11, Leeds, England
"Don't watch it, it's boring and in 3D it was even worse!"
Lily, 13, Manchester, England
"We went and watched it. Hannah and I loved it but Flora didn't."
Tracy, Hannah & Flora, 8-10, London, England
"I think it was brill, so good I could just go and see that again!"
Jack, 12, Somerset, England
"This is the BEST film ever! I saw it twice because I loved it so much! Brilliantly made. Hiccup, Astrid and Toothless are fab! Five stars."
Flora, 11, Shropshire, England
"It was the best film I have ever seen. I love Toothless, he is so cute and funny! I would give it 10/10 it is so, so good."
Helena, 11, Huddersfield, England
"This film is so great! Me and my brothers loved every second of it. I really want the DVD when it comes out. I would give it 10/10, it is that good!"
Lucy, 9, Maidstone, England
"The movie is full of fun, action and of course, Dragons! I watched it in 3D and it felt like it was in the room!"
Olivia, 12, Shropshire, England
"I went to the cinema on Saturday and at first I wanted to watch The Spy Next Door but I watched this instead. First, I thought it was going to be very boring, but it started to get better. I would give it 5/10 in rating!"
Zareen, 14, Burnley, England
"This is the best film I have ever seen! I saw it twice - first in 2D, second in 3D. The effect of the 3D is so amazing! I can't wait for it to come out on DVD! 5 stars, definitely! See it!"
Laelia, 9, Shropshire, England
"The film is nothing like the book. Despite that, it was a great film!"
James, 10, Dubai, UAE
"I think it was great but they should work on the 3D."
Ibraheem, 9, Luton, England
"I love hiccups, sarcasm and I like the whole thing, however I think they altered the storyline from the book way too much."
Isabella, 10, Ipswich, England
"It is nothing like the book and in 3D there aren't many amazing bits."
Oliver, 11, London, England
"It was excellent and it was brilliant! The boy was the best!!"
Gaby, 5, Co. Fermanagh, N. Ireland
"Well I liked it, it was good, but I read the book FIRST and it is very different."
Sarah, 9, London, England
"I loved it because there are not a lot of movies like this. I think people are silly to think it's terrible, rubbish or boring - I think it's GREAT!! I CAN'T WAIT FOR THE DVD!! The part when Hiccup lost his foot was a bit sad, but other than that 10/10!!"
Laura, 11, Hayes, England
"There is one word to describe that movie. HORRIBLE! It was so boring. Don't watch it!"
Nina, 11, Dover, England
"This is just as good as Shrek and Madagascar. In fact it's even better! One of the best animations I have seen for a while and I would definitely go to see it again!"
Jonathan, 11, Northamptonshire, England
"I don't like the film. Me and my best friend Lily went home in the middle of it, it was that BORING."
Maddie, 13, Manchester, England
"One of the best films I've seen can't wait to see it again. Hiccup is brill and Toothless is my fave dragon."
Kayleigh, 7, Co. Wicklow, Ireland
"It was terrible I tell you, terrible!"
Tiara, 9, Dublin, Ireland
"Brilliant! When I saw the ad I wasn't expecting it to be like it was, but it was brilliant."
Eilis, 9, Dublin, Ireland
"It the best film in the world!"
James, 10, Hampshire, England
"I loved it and I think it was cute and nice and I would like to get a dragon."
Ellah, 6, Bedfordshire, England
"I love How To Train Your Dragon and I love Toothless, he's so cute."
Grace, 7, England
"The film was BRILLIANT! The fact that it was 3D made it even better! I would recommend it to people of all ages from one to 101! My favourite character is Toothless because he was funny at times and very obedient to his owner, Hiccup. Anyone who gets the chance to see this film, take it while you can!"
Cameron, 10, Essex, England
"I don't care what everyone else thinks, I LOVED this film."
Lisselle, 10, Nottingham, England
"I loved this film. Parts of it were quite scary for me but mostly the funny bits made up for it!"
Erin, 6, Manchester, England
"I thought it was a brilliant film. I really liked the animation."
Charlie, 8, Staffordshire, England
"It was not as good as I had hoped."
Lillian, 9, County Londonderry, N. Ireland
"One of the best films I've ever watched. I wish people would stop criticising it, because it's fab! I give it 9/10."
Maddie, 10, Norfolk, England
"I love the movie!"
Jessica, 12, Caerphilly, Wales
"It was alright but most of the jokes were from Chicken Run and the music sounded the same too. 3/10."
Robbie, 11, London, England
"I thought the six-eyed dragon was scary, and I thought it was a bit silly!"
Jennifer, 9, Swansea, Wales
"Well, I thought it was going to be good at first, after all, the only reason I even wanted to watch this film was because it was made by DreamWorks. I thought it would turn out good like all the Shrek films, but it was a bit rubbish. I didn't like it. I think they just wasted their time making this film and I wasted my time going to watch it! I'll give it 3/10 in rating!"
Razir, 12, Middlesex, England
"This film is ace!"
Emily, 11, Worcestershire, England
"I really enjoyed this film and I think it will be a family favourite like Shrek and Madagascar who where produced by the same team. I do not think the advert does the film justice as it only really grabs the attention of younger audiences where as the actual film is suitable for the whole family."
Helen, 12, Bedfordshire, England
"It was SO cool in 3D, the dragons look so realistic when they fly at you! The plot of the film isn't excellent like Shrek or Alice in Wonderland but the 3D effects were good. I think without the 3D it wouldn't be as interesting. 6/10"
Saz, 12, London, England
"I absolutely LOVED it! It's such a great film, full of action and comedy. I think it was probably the best film I have ever seen. Better than Harry Potter. Five stars - definitely!"
Lily, 10, London, England
"It is good, but some characters are horrible."
Rose, 8, Nottinghamshire, England
"This is the best film ever!"
Sebastian, 10, London, England
"It is really funny."
James, 6, Oxfordshire, England
"I am a big fan of the books it is based on, but in the books dragon's are good, not evil, and Toothless is tiny and does not have any teeth. My opinion is that DreamWorks should have made a totally different film altogether, or maybe made it about wolves, not dragons, because a wolf is something that is misunderstood and nobody has made any movies about them."
Robyn, 10, Aberdeenshire, Scotland
"It was an amazing film! I went to see it with my younger brother and mum and we all enjoyed it very much! My brother was particularly excited because he has read all of the books. When he found out that they were becoming a film, he immediately went onto the website to check everything out!!! A must see! 10/10!!"
Louisa, 12, Herefordshire, England
"This film was amazing. One of the best I have ever seen in my life! If I get to rate it then I would give it 5 stars! I LOVED IT! IT WAS AWESOME!!"
Robert, 11, Manama, Bahrain