The Powerpuff Girls S01 E05 Octi Evil

"Saving the world before bedtime."

The heinous Him toys with Bubbles' mind by speaking to her through Octi, her favorite stuffed animal. Following Octi/Him's instructions, Bubbles provokes a fight between her sisters that prompts the Professor to issue a time-out until the Girls can make amends and make squid meat out of the giant, Him-controlled Octi.