User blog comment:27finnsprincess/The Talk About Marcy and Ice King.../@comment-5800078-20121016063324/@comment-5111235-20121016064514

I think they came from season five or six. If you notice, Marceline isn't even wearing the same cloths or has the same hair style in the story board drawing as she did in "I Remember You". If they just scrapped it, then they also changed her entire appearance for the episode.