Phineas and Ferb (2007)

S5E20 Attack of the Candace Suit

Buford's creation, a suit designed to mimic Candace, springs to life and sets out to usurp the real Candace's existence. As it navigates her world, the suit tries to replace her, leading to a series of comedic and chaotic situations as it struggles to truly understand what it means to be Candace.