Ernie Coombs hosted this simple format TV show as Mr. Dressup. With his puppet friends, originally Casey and his dog Finnegan, he taught pre-school subjects with games, music and simple activities. To add to the fun, Mr. Dressup would always open up his tickle trunk that contains any costume for any role he wants.

Mr. Dressup emerged from an earlier attempt to devise a regular daily show for children entitled Butternut Square.