User blog comment:27finnsprincess/The Talk About Marcy and Ice King.../@comment-1784834-20121012013153

Anything involving the comics has been officially declared non-canon. So any interaction between Marceline and Ice King in the comics never happened in the show. Nor did anything about the Bag of Holding, The Lich escaping the Snail's body, or the time machine. But I wish "Fionna & Cake meet Finn & Jake" was a real episode!