Between Arkham Origins and Arkham Asylum Incident
After Arkham Asylum Incident
After the Arkham Incident Penguin shot and stuffed the hyenas then put the two on display in his Museum.
Arkham City Incident
When activating the display, the Penguin's recording says '"Recognize Joker's pets? Me too. That's why I had them shot and stuffed!" Scanning the hyenas solves the riddle "Have Joker's pets laughed themselves to death, or just eaten too much?"
Arkham Underworld Incident
Bud and Lou can be attained through upgrading Harley Quinn, and are used to fight beside her in combat.
- Bud and Lou were named after the reowned Comedic Duo - Bud Abbott and Lou Costello.
- Bud and Lou were featured as Harley's pets or "babies" in Batman: The Animated Series.