Prototypes were built for a first wave, which would include Ernie, Bert, Cookie Monster, Super Grover, and Oscar the Grouch. Prototypes of their accessories were also built. The accessories included: for Ernie: Rubber Duckie, banana, and letter E. for Bert: Pigeon and letter W. for Cookie Monster: plate of cookies, cookies, teacup, and letter C. for Super Grover: cape, helmet, and letter G. for Oscar: trash can lid (Oscar would have been permanently inside the can, and both Slimey and a Scram sign would have been permanently attached to the trash can) and letter O.