Episode Title:
Broke His Crown.
Episode Description:
While visiting the Ice King, Princess Bubblegum and Marceline notice he is acting stranger than usual. Bubblegum takes Ice King and his crown back to her laboratory, where she and Marceline enter the crown via virtual reality. They discover the crown is a maze, with circuitry running on its walls. There, they meet the original Gunther (voiced by Pamela Adlon). It is here that Marceline is reunited with Simon Petrikov who expresses his worries about what has been happening recently within the crown. The group discover a malware program, taking the form of a bodiless Betty, infecting the crown. Simon tries to get through to Betty to stop her from spreading it; he eventually succeeds, and the AI Betty is able to remember him and cease her alterations of the crown's circuitry. As such, the crown starts to reprogram to block access of foreign objects, and Marceline and Bubblegum are forced to leave. They return to the lab and take Ice King back to his kingdom—without him remembering a thing.
