Fey and Gervais join the Muppets
Actors and comedians Tina Fey and Ricky Gervais have joined the cast of the Muppets for their seventh film.
Fey plays a Russian prison guard called Nadya.
The 2011 Muppets film was a commercial success after it grossed over $165m worldwide.
Ricky Gervais and Tina Fey spoke about their roles in the film.