LONDON: (BT) Sir Michael Caine has joined the cast of new spy movie The Secret Service. The Oscar-winning British star will play the lead agent in the film, reported The Sun. The 80-year-old could be sharing the screen with Colin Firth, as earlier this year it was reported that the King’s Speech star looked set for a role in the film. Liam Neeson has also been linked to the project, which will be directed by Matthew Vaughn. The Secret Service is based on a comic book which Matthew co-created with Mark Millar.