12 February 2010, rated PG
You probably won't have seen any of the film's young actors before, although they've all been in other movies or TV shows.
The adults are played by some fairly famous actors. Pierce Brosnan, who was James Bond before Daniel Craig, plays Chiron the Centaur. Steve Coogan, who was Octavius in the Night at the Museum movies, plays Hades, God of the Underworld. Sean Bean, who was Boromir in the Lord of the Rings films, plays Zeus.
Percy Jackson is a dyslexic teenager living in New York City. He soon discovers he is the son of the Greek God Poseidon, which is why he has so much trouble reading in the human world.
A lightning bolt belonging to Zeus, the God of all Gods, goes missing and he blames Percy, which means Percy and his family are in danger. His mum gets kidnapped by Hades.
Percy has to go and stay at a demigod training camp called Camp Half Blood. After learning how to use his powers, he goes off with fellow demigod Annabeth (daughter of the Goddess Athena) and his satyr protector Grover to clear his name, rescue his mother and find Zeus's lightning bolt.
The film has great action scenes. And the special effects are really good. I thought Medusa's snake-covered head was one of the best bits. Every time I saw it, I kept having to itch my head because it really did give me the creeps!
I hadn't read the book, but I didn't feel it mattered at all. The movie explains what's going on very well so there's no confusion.
And if you haven't learnt about Ancient Greece at school, you end up learning loads about it without realising.
I loved Chiron the Centaur - he looks so realistic! And Grover has the funniest lines.
Any weak bits?
It's not clear why Percy is accused of stealing the lightning bolt in the first place.
It's also a bit strange that he suddenly became a good fighter without much training- but I guess he is a demigod after all!
Although you don't miss this film not being in 3D, I think the makers of the next PJ movie should seriously think about using it in the next one.
Hit or miss?
There are loads of similarities with the Harry Potter series - the main characters are two boys and a girl, it's full of magical powers and there are loads of fight scenes against the baddies. Instead of Hogwart's, there's a secret training camp called Camp Half Blood (sound familiar?).
And just as Harry travelled to the magical world through King's Cross Station, Percy and his friends can get to Mount Olympus through the Empire State Building.
But there are lots of differences too. Hollywood is hoping this film will be as popular as Harry Potter on the big screen. I'm not sure it's going to be quite so big, but there's definitely room for more action adventure fantasy films.
This reviews page is now closed.
"It's the best film I have ever seen. I love Percy!"
Alex, 10, East Sussex, England
"Percy Jackson was fantastic. 10/10!"
Niamh, 10, East Sussex, England
"WOW! What a great movie! If the books are great, the movie is out if this world! Percy Jackson is fantastic!"
Bethany, 10, Essex, England
"The best film in decades."
Walter, 8, Lincoln, England
"The movie is great and Percy is my favourite character!"
Indigo, 9, London, England
"I went to see it and it was immense. I was amazed all the way through."
Rachael, 10, Reading, England
"This is cool! We learn about Ancient Greek at school so seeing this came in handy."
Keely, 9, Birmingham, England
"I absolutely loved Percy Jackson! It was amazing. I had read the book before and there were a lot of bits missing in the film."
Olivia, 10, Sheffield, England
"I think it is really fantastic in 3D at the cinema."
Adam, 8, Yorkshire, England
"I love the film but I was really scared. It's one of the best films I have watched."
Naomi, 10, Bristol, England
"I loved this book and film."
Salia, 12, Manchester, England
"I love Logan Lerman . He is a role model for me and an amazing actor always leaving me speechless!! And for the movie, it was AMAZING!!"
Vicki, 14, Southampton, England
Amy, 7, Glasgow, Scotland
"Fantastic. I'm even reading the book! It was the best film ever."
Jamie, 10, Tyneside, England
"I thought the film was really cool. I love the storyline of the film. It incorporated both Greek myth and modern world really well. I'd give it a 9 out of 10."
Jo, 12, Gloucestershire, England
"I thought Percy Jackson was GREAT!! I think it was the best movie I have watched in ages! 10 out of 10 for me, brilliant film!"
Sebastian, 10, Hampshire, England
"It was amazing. I loved it and I cant wait for the next one. It strays from the book though, but it's still 10 out of 10!"
Mischa, 11, London, England
"If you're a big fan of the book, you will definitely be disappointed! Percy Jackson is one of the most disappointing films of this year. I would only give it 3/10."
Saim, 10, London, England
"Percy Jackson rocks my world!"
Lei, 11, Derby, England
"Watched Percy Jackson. Amazing film. Loved it. I can't wait for it to come out on DVD."
Natalie, 11, Kent, England
"This film is so cool, I loved the bit with Medusa. I would give it 10/10 because it is amazing and kind of scary. This film is a hit!"
Olivia, 10, London, England
"I thought Harry Potter was good but Percy Jackson beat it. I loved all of the film and I can't wait for the next movie."
David, 12, Liverpool, England
"I loved the film but it made me jump a bit."
Alison, 11, Leeds, England
"I think Percy Jackson and the Lightning Thief is really good. I love the Medusa bit and the way Percy acts. I went to see it with my sister's friends and because it was so shocking I spilt juice all down my front!"
Orla, 9, Belfast, N.Ireland
"The film was good and it made you jump a bit but it was really brilliant."
Lewis, 10, Newcastle, England
"Percy Jackson and the Lightning Thief is awesome, it rocks. It is the best movie in the whole wide world."
Natalia, 9, West Yorkshire, England
Adeola, 10, London, England
"This film was by far the best one I have ever seen that has magic in it. Even though I like Harry Potter it comes second best to Percy Jackson And The Lightning Thief. It's five stars from me."
Kate, 12, Bristol, England
"Percy Jackson was amazing! I loved it! Some bits were a bit like Harry Potter but it was still good! Grover was so funny!"
Katie, 12, Derbyshire, England
"I really love the movie, it is excellent. Percy Jackson is a funny movie. I like Grover too because he is funny."
Albert, 11, Essex, England
"I LOVED PERCY JACKSON! It was one of the best things I'd watched in ages! The only thing is that it is very different to the book."
Beca, 11, Cardiff, Wales
Lucy, 10, Oxford, England
"I think Percy Jackson is one of the best movies ever and the books are just as good."
Milly, 10, Hertfordshire, England
"I think Percy Jackson and the Lightning Thief is excellent! The film also teaches you a bit more about the Greeks and Gods! It is fascinating. I went to see it with my friend and we both loved it!"
Ebony, 9, Essex, England
"I think Percy Jackson and the Lightning Thief is one of the best movies I have seen for months! I can't wait till the next one comes out!"
Anna, 10, Leeds, England
"I saw Percy Jackson in February and I loved it. It was one of the best films I have ever seen. If you have not seen it you should go. It is brilliant!"
Megan, 8, London, England
"We think it looks rubbish and totally random."
Michael and Adam, 11, Barnsley, England
"It's a very good film. I think it's brilliant."
Victor, 8, Barnsley, England
"The film is so cool, I think they should make another one."
Dexter, 10, Essex, England
"It is an amazing film and also very scary at the same time!"
Lucy, 14, Newcastle, England
"I really enjoyed the film and I was so excited to see well known actors! I read the book before watching it and I agree with those that say the book was much better, however the film was still a great success."
Kaitlyn, 14, London, England
"After seeing the film I have read the book, and I have to say they're so different! The film was brilliant though, the best one I've seen since Harry Potter and the Half Blood Prince. Read the book!"
Kay, 12, York, England
"The film was good but the book was definitely better. There were a lot of good bits in the book that weren't in the movie."
Todd, 13, Cornwall, England
"The film was great but it was nothing like the book. I read the book long before the film and I loved it. The director has changed too many things in the movie."
Isabella, 13, Italy
"It is amazing, it is my favourite movie. It has adventure, action, special effects and comedy. Brilliant!"
Jeevan, 12, London, England
"To be honest, I didn't think Percy Jackson was going to be as good as it was. It turned out to be brilliant and I loved it. It wasn't too long but it wasn't too short either. I also thought it was just going to be all action scenes but there was a mix of everything. I'd recommend this film to everyone as I thought it was really good."
Helena, 13, Isle Of Wight, UK
"I went to see Percy Jackson a few weeks ago and I LOVED it!! I like the movie because even though it had a bit of drama in it, it still had a little bit of comedy in it too!"
Amy, 10, West Lowlands, Scotland
"This was the best movie ever, I was on the edge of my seat when I saw it."
Georgia, 11, Derbyshire, England
"I agree that the book was much better than the movie. They left out a lot of the events in the movie."
Dylan, 12, Malaysia
"The movie is good if you haven't read the book. I have read it and have to say the movie was kind of a let down. Lots of good bits in the book were not shown in the movie."
Malaika, 13, Oregon , USA
"I think the movie was great but it missed out a lot of fun parts. It could have been better. Overall, I would rate it four stars."
Lauren, 12, Penang, Malaysia
"Wonderful. Absolute awesome. I was dumbstruck by this movie."
Matthew, 12, Penang, Malaysia
"A really good film but nothing like the book."
Chrissy, 11, Gloucestershire, England
"I have to admit that the film was fantastic. At the start I thought it was quite boring but then it got more exciting. I give it about four out of five."
Lucy, 10, Swindon, England
"When I went to see the film I knew it was going to be amazing but never knew how AMAZING the effects would be. For World book day I'm reading Percy Jackson and the Sea Monsters. I'm already on Chapter 3!"
Harry, 11, Hampshire, England
"It shows a fantastic array of Greek legends in modern form. It's a fantastic film, definitely a must-see!"
Hannah, 9, Liverpool, England
"I think the Percy Jackson movie is fantastic. It is funny and historical but still serious. I recommend anyone who likes action and comedy to see it!"
Hetty, 11, Cardiff, England
"Not too good, not too bad."
Faatimah, 9, West Yorkshire, England
"The film was great, but nothing compared to the book. There are loads of differences that would have been better if they had stuck to the book and the plot is totally different. I was not that into the film, but it was OK."
Kourtney, 13, London, England
"It was OK but it wasn't like the book."
Kohei, 12, Penang, Malaysia
"The movie was OK. I liked the special effects but it could have stuck to the book better."
Fahim, 11, Manchester, England
"The movie was OK but the book was much better! The movie missed the main parts, so I would have to give it three stars."
George, 12, Surrey, England
"It's a really great movie."
Rosa, 11, Penang, Malaysia
"I saw the premiere of it and I really enjoyed it. At one point I thought it would end in a very sad way, but it didn't and it surprised me! I really do recommend it."
Kirsty, 11, Hertfordshire, England
"Percy Jackson And The Lightning Thief is a fun and an exiting movie! At first I didn't want to watch it but when I sat down and watched the FIRST scene I absolutely fell in love with it!"
Adam, 11, Stockport, England
"It was waaay better than Harry Potter, but the movie did not stick to the book!"
Conor, 10, Watford, England
"Percy Jackson is an amazing film about an ordinary boy who is really a Demi God. These people are half Greek God, half human."
Jake, 11, Hereford, England
"I think the film was really good. It is jam-packed with action and is very exciting. I also thought the special effects were super! LOVE THE FILM!"
Hinna, 13, Woking, England
"I think Percy Jackson is so cool. I love myths like the minotaur as well!"
Isabelle, 9, West Midlands, England
"It looks like it is copying Harry Potter!"
Lara, 10, London, England
"I really enjoyed it. It's funny and quite scary. It is very shocking when you find out who's the thief!"
Dan, 10, Birmingham, England
"I can't believe it! I went to watch this with my cousin and thought it was just a boys film. When it started I felt a shudder of excitement run through my body! It is the best film I have ever watched!"
Jessica, 11, Merseyside, England
"This film rocks dude, go and watch it. Beg your parents!"
Amy, 10, Merseyside, England
"I loved the film and want to watch it again and again."
Morgan, 11, Berkshire, England
"It's rubbish, the worst film that I have ever seen."
Ashley, 11, Wolverhampton, England
"I LOVED Percy Jackson. For me it was even better that Harry Potter."
Urvi, 11, Middlesex, England
"It is an amazing movie. The special effects and the storyline are brilliant, but I prefer the book."
Qasim, 10, Lancashire, England
"Percy Jackson is a pretty cool guy. He steals lightning and isn't afraid of anything!"
Nathan, 9, Carlisle, England
"I love the film, it is the best and I was so excited when I went to see it."
Danielle, 12, Norfolk, England
"That was the best movie ever! It had action and adventure the whole way through, unlike Harry Potter. 10/10"
Alex, 12, Coventry, England
"I've watched it already but I want to watch it again. It is really good."
Hope, 10, London, England
"This film is awesome! I recommend it to everyone!"
Izzy, 11, London, England
"I think it is wicked."
George, 10, London, England
"Great film, watch it now."
Simon, 12, Cambridgeshire, England
"This film is breathtaking, it really makes you think!"
Bonnie, 11, Isle of Wight, England
"This film didn't live up to my expectations from the amazing book series, but was good enough. The plot was quite weak in places but the characters and effects made up for it. This gets an 8/10."
Patrick, 13, Cambridgeshire, England
"It was a bit disappointing because it was not as good as the book. I give it 8/10."
Tom, 12, Buckinghamshire, England
"I loved this film and although there are similarities to Harry Potter it's still awesome. The book is amazing! I'm going to see it again at the weekend."
Ellie, 12, West Yorkshire, England
"I think that Percy Jackson is a copy of Harry Potter."
Aleena, 11, Manchester, England
"I think the film is amazing, it's like a better version of Harry Potter."
Humna, 11, Glasgow, Scotland
"It is the best film of the year."
Adam, 10, Kent, England
"I think it is funnier than Harry Potter and less dreary."
Juliet, 10, London, England
"I liked the bit when the pencil turned into a sword. This is the best movie I've ever seen."
Mohammed, 9, Coventry, England
"It was amazing, I loved it. My brother, my dad and my dad's girlfriend all loved it too! It is a film I would want to see again!"
Katie, 11, Burnley, England
"I have the book and it's good."
Sean, 11, Ayrshire, Scotland
"I think Percy Jackson is an amazing film."
Samantha, 12, London, England
"It was the best movie since Harry Potter. There were very scary parts but my friend and I loved it and want to watch it again and again."
Millie, 10, Hampshire, England
"I love this film. It's really exciting."
Eleanor, 8, London, England
"It is so amazing, with an excellent plot and jaw-dropping effects! I couldn't take my eyes off the screen. It's so brill! If you loved the film, you'll be spellbound by the books!"
Emily, 13, England
"It was amazing!"
Sienna, 8, London, England
"Amazingly fantastic! Super duper! The best thing in the world!"
Carmina, 8, London, England
"I have read all the books and I think that the movie was even better! It's funny, exciting and the special effects were amazing. My dad jumped every five minutes!"
Joshua, 10, Northumberland, England
"This is a great movie, especially for people who are massive fans of the Harry Potter movies and books."
Emma, 9, London, England
"This film was brilliant! There are really funny, sad and scary moments. This film has everything!"
Hamish, 11, Bath, England
"I went to see the movie with one of my mates and sat speechless through the whole thing. It is a stunning movie, made to look as realistic as possible. I would recommend this movie to anyone who has a sense of adventure."
Jessica, 12, Manchester, England
"I think this film is absolutely brilliant. People say it is like Harry Potter, but I think it is better! It is probably the best film I have seen for years."
Tyra, 12, Essex, England
"I love this film. It keeps you on the edge of your seat."
Jay, 10, Hull, England
"I watched this film and I love it! It is hilarious at times and action packed."
Isabel, 12, London, England
"I absolutely love this movie, it is so awesome!"
Fiona, 10, Massachusetts, USA
"The film had me on the edge of my seat the whole way through."
Jonathan, 11, England
"I liked it very much! It was funny and exiting."
Abs, 14, Buckinghamshire, England
"I've read the book and I was really excited when I heard it was going to be a film. I'm watching it today."
Matthew, 11, St. Albans, England
"This film is amazing. When I saw it at the cinema, I was sitting at the edge of my seat all the time. I give Percy Jackson and the Lightning Thief 10 out of 10!"
Patrick, 12, Glasgow, Scotland
"This was great! A must see!"
Tom, 12, Cheshire, England
"I've seen the film and read the books and I think the film puts things the wrong way round, especially when he arrives at camp."
Lucy, 12, London, England
"Percy Jackson rules and is the best movie ever! Read the books as well!"
Mary-Ann, 13, London, England
"I've read all the books and thought they were amazing. The film has a lot to live up to!"
Lucy, 11, Croydon, England
"I've read the book. Amazing! I am so excited for the film and hopefully it will become a hit like Harry Potter!"
Josh, 13, Shrewsbury, England
"I only read a bit of the book, but I hope that this movie will be successful like Harry Potter!"
Alex, 12, Derbyshire, England
"I've read all the books and thought they were amazing, so I'm looking forward to seeing the film."
Lauren, 14, Devon, England
"I've read the book, met the author and had it signed, but I'm pretty sure I will not enjoy the movie as much as the books."
Megan, 11, Surrey, England
"I don't think this movie looks that good. I like Harry Potter, but I don't think this will be as popular. Not my thing, I won't watch it."
Tamara, 11, Surrey, England
"It was an amazing book. I love all the action and the mix of the modern world with the mythical creatures and beliefs! My favourite book was the third, where the Goddess of Hunt is tricked into holding up the sky."
Chelsea, 13, Liverpool, England