According to the official synopsis, this film, "takes the entire Muppets gang on a global tour, selling out grand theatres in some of Europe’s most exciting destinations, including Berlin, Madrid and London. But mayhem follows the Muppets overseas, as they find themselves unwittingly entangled in an international crime caper headed by Constantine—the World’s Number One Criminal and a dead ringer for Kermit—and his dastardly sidekick Dominic, aka Number Two, portrayed by Ricky Gervais."
Source: Empire