Disney has unveiled first images and new details about its newly titled Muppets sequel, Muppets ... Again!

The follow-up to the 2011 hit finds the Muppets on a world tour, where they become entangled with a criminal mastermind named Constantine, a dead ringer for Kermit who's out to steal an enormous diamond.

“It’s great to be back working with the Muppets,” returning James Bobin said in a statement, “some of them even remember my name occasionally now. As for the movie, it’s a tip of the hat to the old-school crime capers of the ’60s, but featuring a frog, a pig, a bear and a dog-no panthers, even pink ones-along with the usual Muppet-y mix of mayhem, music and laughs.”

Written by Bobin and Nicholas Stoller, Muppets ... Again! stars Ricky Gervais, Tina Fey and Ty Burrell. Here's the official description:

Disney’s “The Muppets …Again!” takes the entire Muppets gang on a global tour, selling out grand theaters 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, creator of “Derek” and the Golden Globe(r)- and Emmy(r)-winning series “The Office” and “Extras.” The film stars Golden Globe-, Emmy- and SAG Award(r)-winning actress and writer Tina Fey (“30 Rock,” “Mean Girls,” “Date Night”) as Nadya, a feisty prison guard, and Emmy Award winner Ty Burrell (TV’s “Modern Family”) as Interpol agent Jean Pierre Napoleon.

The film, which began production last week in London, opens March 21, 2014.