Lost in Space Harris as an older Will Robinson and Zachary Smith. They attempt one more time to return to Earth but find that they are "Lost in Space ... Forever!" Lost in Space showcased a variety of transportation methods of transportation in the series. The "Jupiter 2" is a two-deck, nuclear powered flying saucer spacecraft. The version seen in the series was depicted with a lower level and landing legs. On the lower level were the atomic motors, which use a fictional substance called "deutronium" for fuel. The ship's living quarters feature Murphy beds, a galley, a laboratory, and the robot's "magnetic
What Was Missing Jake joins in; the band disbands. Finn, dismayed at his friends' behavior, sings "My Best Friends in the World", bemoaning the fact that his friends are fighting. Bubblegum, Marceline, and Jake join in, and the four are able to open the door. Inside, Finn, Jake, and BMO reacquire their belongings. The group also finds a black rock T-shirt which they mistake to be Marceline's. However, it is revealed that it is Bubblegum's; it was a gift given to her by Marceline in the past. Finally the group turn to Marceline, asking what she had lost. When they realise she only