“Adventure Time” left off with a pretty big cliffhanger back in March — Finn’s human dad is alive and at the Citadel. Now in the Season 6 premiere, Finn and Jake are setting off to find him.

Our intrepid heroes follow Lich to the Citadel and then must commit a cosmic crime in order to find Finn’s father. Check out the preview video above — nice use of Harry Chapin’s “Cat’s in the Cradle.”

Below, watch a hilarious “Clarence”-“Adventure Time” mash-up. “Clarence” is a new Cartoon Network show that airs Monday nights at 7 p.m. ET/PT. “Adventure Time” Season 6 premieres Monday, April 21 at 6 p.m. ET/PT on Cartoon Network.

Posted by:Andrea Reiher

TV critic by way of law school, Andrea Reiher enjoys everything from highbrow drama to clever comedy to the best reality TV has to offer. Her TV heroes include CJ Cregg, Spencer Hastings, Diane Lockhart, Juliet O'Hara and Buffy Summers. TV words to live by: "I'm a slayer, ask me how."