Justice League Action: Season 1, Episode 30

1 - 30: Supernatural Adventures in Babysitting

After helping Batman take down some criminals, Stargirl babysits Professor Anderson's son Timmy while he is away. During this time, Klarion the Witch Boy invades Professor Anderson's house and poses as Timmy in order to obtain the Magdalene Grimoire. Upon Klarion the Witch Boy shedding his disguise when the Magdalene Grimore is found, Stargirl notifies Batman of this and he brings John Constantine to help him and Stargirl reclaim the Magdalene Grimoire and defeat Klarion the Witch Boy.