Jack Black in Gulliver's Travels TrailerFunnyman Jack Black is literally taking on the biggest role of his career in the upcoming 3D film adaptation of 'Gulliver's Travels.'

Black plays a magazine mailroom clerk who talks his way into writing a piece on the Bermuda Triangle. Upon arriving, he gets sucked into a secret world -- called Lilliput -- where he's much bigger than the native inhabitants.

As the titular character, Black looks at ease as he goes for -- wait for it -- big jokes, though the trailer also puts the spotlight on the movie's awesome supporting cast, most notably Jason Segel as a suitor in love with a princess, played by Emily Blunt, who thinks the Millennium Falcon is actually real.

Check out the exclusive 'Gulliver's Travels' trailer debut, and then see the movie when it opens on Dec. 22.