Sparky is a ghost that Slimer tries to make friends with.
Recently trapped by the Ghostbusters, Sparky is freed by Slimer. A mischievous ghost, he prefers to scare people unlike Slimer. Sparky travels around the city with Slimer, and while Sparky is scaring everybody they come across, Slimer is instead helping. Sparky eventually got fed up with Slimer helping people and joined other ghosts in haunting a house, only to be trapped by the Ghostbusters once again.