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Robopet is the name for a robotic pet, designed to look like a baby seal, that were created by Martin Prince and Bart Simpson, though the former did all the work.

Bart needed a project for the science fair when he saw Martin hanging from a tree. Martin agreed to help Bart and started to put ideas together. Bart came up with the Homer Humiliator, a device which is designed to humiliate Homer, however, Martin doesn't see the practical use of it. Bart then came up with an idea for a robotic pet (after seeing Santa's Little Helper with a Darth Vader mask on). Together, they made the robot, in the design of a baby seal as everyone goes "awwwww" when they see them.

Bart then takes the Robopet to the Springfield Retirement Castle when it is an instant hit with Jasper Beardley, making him a lot happier as he had been very depressed lately. Bart then mass produces them and all the residents have them. By this point, Bart had gotten enough money to make his original idea for a project, the Homer Humiliator. However, funeral directors dislike that less old people are dying because they are happier and reprogram them to make them kill the old people, one of them killing Alice Glick. More deaths mean more business for them.