Bye, Bye Bellum / Little Octi-lost

S1 E1004: Bye, Bye Bellum: The Mayor becomes dependent on the Powerpuff Girls after his assistant Ms. Bellum departs, leaving the girls so busy they accidentally hire the dangerous Bianca Bikini as his new assistant! When Bianca captures the Powerpuff Girls, the Mayor finds the tables turned and must rely on himself to help them. / Little Octi-lost: Buttercup steals Octi to teach Bubbles a lesson but ends up wanting to keep him for herself.