Agent Olive as Gidget
Agent Otto as Max
Oscar as Duke
Ms. O as Max and Duke's owner
Odd Squad villains as the Cats
Odd Todd as Snowball
Agent Otis as Mel
Agent Olympia as Chloe
Oona as Gidget's Owner
Agent Ocean as Buddy
Mayor Macklemore as Pops
Agent Orsen as Norman
Agent Oren as Sweet Pea