You will Watch Adventure Time Season 1 Episode 15 online for free episodes with HQ / high quality. Stream cartoons Adventure Time Episode 15 What is Life? Finn builds a Never-Ending Pie-Throwing Robot (N.E.P.T.R., voiced by Andy Milonakis) to pull a prank on Jake, but the machine’s conscience is conflicted by the will of the Ice King when he is attacked by a lightning bolt that contained the Ice King’s private particles. Eventually, N.E.P.T.R. choose to side with Finn.