"It's not easy... being mean."

The world's foremost criminal mastermind, Constantine, is small and felt and green all over. And he looks just like Kermit the frog, which is good news for this bad guy and bad news for our good guy because Constantine escaped from prison and guess who's going to take his place?

After Constantine and his evil sidekick Dominic (Ricky Gervais) pull off a master heist, Kermie is set up for the crime. Our little green friend is sent to what looks like a rather rough Russian prison. His prison guard, Nadya, is not one to be trifled with, although we suspect some delicious night cheese could sway her. (Because she's played by Tina Fey, you see.) Luckily, there's an Interpol agent named Jean Pierre Napoleon (Ty Burrell) on the case.

How long will it take Gary the Muppet and the rest of the gang to realize that Constantine is not the frog they know and love? More importantly, how many cameos will we spot along the way? You can see Sean Combs, Celine Dion, Stanley Tucci, Zach Galifianakis, Ray Liotta, Danny Trejo, and Christoph Waltz in the trailer, just for starters!

"Flight of the Conchords" writer/director James Bobin has returned for this sequel to the 2011 "Muppet" movie, and his "Conchords" cohort Bret McKenzie provides some tunes.

"Muppets Most Wanted" will be released on March 21, 2014.