Muppets Most Wanted finds Kermit discovering that he is the doppelgänger of an international criminal known as Constantine, which leads to him being thrown in prison. ...appearances from Tina Fey ...

Obviously, Kermit the Frog is already an international movie star in his own right. He appeared in The Muppets, The Muppet Christmas Carol, Muppets Most Wanted, The Muppets Take Manhattan.