The Powerpuff Girls S02E02 - Schoolhouse Rocked

The Powerpuff Girls (1998)
S02E02 Schoolhouse Rocked
Episode Overview
Following their run-in with a truant officer, the Gang Green Gang finds themselves back in kindergarten, ready to unleash their mischief at Pokey Oaks. Armed with clever pranks, they set out to cause chaos in the classroom, determined to make their presence felt once again.