Finn creates a Never-Ending Pie-Throwing Robot (Neptr) to prank Jake, but it unexpectedly comes to life! Yet when he decides to use some of the Ice King's power to further develop it, this ultimately leads to a moral dilemma for the new living machine.

The Ice King is finally getting married, but consults Finn and Jake on whether or not to go through with getting hitched or keeping his life of abducting princesses.