When Gosalyn gets into mischief, a spirit named Paddywhack is unleashed from a jack-in-the-box and possesses Quackerjack's doll, "Mr. Banana Brain". As he causes trouble alongside the demented toymaker, he grows, feeding from the negative emotions around himself.
- Paddywhack was supposed to return in an episode titled "Pranks for the Memories", intended for the show's third season on ABC, but the series was canceled at the end of its second season.
- Part of this episode was recreated with different animation in the DuckTales episode "Friendship Hates Magic!"
- The episode title does not appear at the beginning of the episode as it usually does. Instead, DW initially announces the episode title as "The Terrifying Terror of Darkwing Duck!", before Gosalyn announces the true episode title.