The Simpsons (1989)

S31E14 Bart the Bad Guy

Bart unintentionally catches an early screening of a highly anticipated superhero film, a full month ahead of its official release. Armed with insider details, he begins to wreak havoc among fellow fans, relishing in his knowledge. Meanwhile, two of the film's executive producers scramble to contain the situation, determined to stop Bart from revealing any further information to the public.