"Mortal Folly" is the twenty-fourth episode of the second season of the American animated television series Adventure Time. The episode was written and storyboarded by Adam Muto and Rebecca Sugar, from a story by Mark Banker, Kent Osborne, Patrick McHale, and series creator Pendleton Ward. It originally aired on Cartoon Network on May 2, 2011. The episode guest stars Ron Perlman (pictured) as the Lich. Perlman's character would become the series' chief antagonist, and would reappear in several fourth and fifth season episodes. "Mortal Folly" was the first part of a two-part episode; this marked the first time an Adventure Time episode carried into another episode. The plot was concluded with "Mortal Recoil" which aired on the same day. The episode introduced the Lich, who had first been proposed in the series' pitch bible. Sugar and Muto decided to make the Lich a scary and dangerous character, and purposely played up the darker elements of the episode. The episode was watched by 1.92 million people and received largely positive critical attention; many critics enjoyed the way the episode began to set up the series' mythology.

A stand of Cartoon Network at the CNN Center in Atlanta in 2007.

• March 2, 2000 – I Am Weasel finishes airing on Cartoon Network
• March 17, 1997 – Toonami debuts on Cartoon Network
• March 23, 2012 – Ben 10: Destroy All Aliens, a computer-animated science fiction action film premieres
• March 25, 2005 – The Powerpuff Girls finishes airing on Cartoon Network
• March 30, 2007 – Billy & Mandy's Big Boogey Adventure, a television film of The Grim Adventures of Billy & Mandy airs

• ... that the animated sitcom Home Movies switched to Flash animation for its second season?
• ...that the third season and its episodes of the animated sitcom Home Movies won two Pulcinella Awards in 2003?
• ...that, based on its pilot episodes, one critic stated that Danny Antonucci's (pictured) Ed, Edd n Eddy was the worst Cartoon Network show, and another said that the funniest thing about it was its title?

Main project

WikiProject Cartoon Network

Task forces

Adult Swim • Aqua Teen Hunger Force • Ben 10 • Ed, Edd n Eddy

Parent projects

WikiProject Animation • WikiProject Television

Related projects

WikiProject Film • WikiProject Video games • WikiProject Music • WikiProject Comics