Tracy Jr. was the name given to a small simian who joined the Ghostbusters, Professor Von Ziflin and Jessica Wray in their quest to return the cursed Diamond of Gloom to it's Temple. The young monkey quickly grew attached to Tracy the Gorilla and ended up saving the day when the cursed diamond turned Tracy to stone. It was Tracy Jr. who finally returned the diamond to it's resting place inside the Temple of the Diamond of Gloom, saving the Earth from being doomed in the process.