Marcia is accused by the school principal of drawing an unflattering picture of her English teacher. Mike and Carol believe she is innocent and allow Marcia to have her planned slumber party, but she still has to serve a week's detention at school. Marcia 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. 

This week's episode: The Brady Bunch S2 E3 - "The Slumber Caper" originally aired October 9, 1970