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Fey and Gervais join the Muppets

10 March 2014 Last updated at 12:20 GMT

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.