Media playback is unsupported on your device
9 February 2015 Last updated at 07:44 GMT
Backstage, he spoke to the BBC's entertainment reporter Lizo Mzimba about working with director JJ Abrams, his co-star Daisy Ridley and why fans should be excited about the latest Star Wars blockbuster.

Scowen, 24, who made his first-team debut at the age of 17 with Wycombe, joins on a free transfer having turned down a new contract with the Tykes.
Enfield-born Scowen played 44 games to help Barnsley to a 14th-placed finish in England's second tier last season.
He moved to the Oakwell club for an undisclosed fee in January 2015.
Find all the latest football transfers on our dedicated page.

Three bodies were found in streets nearby.
A threatening message was left next to boxes, warning what were described as "traitors" and "blackmailers".
Guerrero state, home to the seaside resort of Acapulco, has been plagued by years of drug-related violence.
The latest gruesome incident created havoc around Chilpancingo.
The body parts were discovered at around 03:00 local time (08:00 GMT) on Sunday morning.
Police have not yet identified the victims. The gang has identified itself as Los Jefes, or The Bosses.
Some of Mexico's most notorious gangs have been fighting for control of drug routes along the country's Pacific coast.
Smaller criminal groups are also known to operate in Guerrero state, kidnapping for ransom and extorting farmers and shop owners.
In 2014, 43 students disappeared in Guerrero, in a high-profile case that highlighted the involvement of local authorities and police with organised crime.
Tens of thousands of people have died in drug-related violence in Mexico in the past decade.
John Boyega, who stars in the new Star Wars film - The Force Awakens, presented a prize at this year's Bafta Film Awards.
[NEXT_CONCEPT]
Queens Park Rangers have signed midfielder Josh Scowen on a three-year deal following his exit from Championship rivals Barnsley.
[NEXT_CONCEPT]
A criminal gang in Mexico has dropped three iceboxes with a severed head in each one near a government building in Chilpancingo, the capital of the western state of Guerrero.