Mr. Jack Wednesday is the main antagonist in the Powerpuff Girls episode "Schoolhouse Rocked".
In the episode, he met the Gangreen Gang in an arcade, where he put them into Pokey Oaks Elementary so they can go to school, though was given a dodgeball to the face for putting them in an environment in which they could take advantage of their new classmates.
Mr. Wednesday had an odd habit of speaking very fast without allowing anyone to get a word in, and indirectly insulting them, such as calling the Gang idiots for not knowing what a 'Truant Officer' was despite them not given a chance to respond, and also insulted Ms. Keane's ability as a teacher.
- He was voiced by Gregg Berger, who also voiced The Gromble.
- He is referred to onscreen as Mr. Wednesday, but is only credited as Truant Officer.