The beloved pet of Stan Marsh, Sparky is his best non-human friend and is homosexual. He is rarely seen within the Marsh household and seems to spend a lot of his time outside when not coaxed indoors by his owners. He spent some time with Big Gay Al at his animal sanctuary and is fully capable of digging, being "milked" and holding eggs in his mouth without breaking them.
- Big Gay Al's Big Gay Boat Ride (s01e04)
- Spookyfish (s02e15)
- Proper Condom Use (s05e07)
- Good Times With Weapons (s08e01; mentioned)
- Woodland Critter Christmas (s08e14; cameo)
- Follow That Egg (s09e10; mentioned)
Sparky is prominent in the game as Stan's animal familiar - he uses a laser pointer to guide Sparky to attack foes, and if one tries to fight Stan, he can regain health by playing with Sparky. He is injured in the final battle when Stan hurts himself and both retire to the side. He also appears very briefly during a cutaway for one of Stan's special attacks.