The Slumber Caper is the third episode of Season 2 of The Brady Bunch, and the 28th overall episode of the series. Written by Tam Spiva and directed by Oscar Rudolph, it first aired 9 October 1970 on ABC.
Marcia's first house party almost doesn't happen after she is accused of scrawling an unflattering picture of her teacher in class.
The girls are excited that their parents are allowing Marcia to host her first slumber party. The boys are less excited about the prospect of a bunch of Marcia's girlfriends invading their house for the night, until Greg comes up with a plan for the boys to have some fun of their own at the girls' expense. It may be a moot point as Mrs. Denton, one of Marcia's teachers, passes along a doodle that was found in Marcia's desk and that has Marcia's name on it to the school principal, Mr. Randolph. The doodle itself is a drawing of a face with the caption "Mrs. Denton or hippopotamus". Marcia admits to having done the doodle, but that the face is supposed to be that of George Washington.
Marcia, however, vows that she did not write the caption. Going only by what he sees as the overwhelming evidence against her, Mr. Randolph decides to punish Marcia. As an extra punishment, Mike and Carol disallow Marcia to have the slumber party. Marcia is more disappointed in her parents not believing her than she is about not having the slumber party. Regardless of Mr. Randolph or her parent's actions, Marcia still wants to find out who wrote the caption. She becomes convinced her best friend Jenny was the guilty party and "uninvites" her. Greg and his brothers conspire to disrupt the party and place itching powder in the girls' sleeping bags. While the girls clean up, Paula, another one of Marcia's friends, admits she took the drawing and added the insulting remark. Marcia re-invites Jenny to the party.