The toy has five 5 pop-up doors, each featuring a Sesame character -- Ernie, Bert, Big Bird, Cookie Monster and Oscar the Grouch. When a switch is activated, the corresponding door is opened, revealing a character. A later version of the toy replaced Oscar with Elmo, and featured rounder, more baby-like sculpts for the characters. In 1995, rival toy maker Fisher-Price produced a similar toy, Pop-Up Pals. The Fisher-Price versions of the toy include voice chips, so that the characters talk and sing.