Beautiful Day Monster First appeared as the Crown-Grabber in the General Foods commercial in 1966, then later gained fame for an appearance on The Ed Sullivan Show in 1969.
Rowlf the Dog First appeared in commericals for Purina Dog Chow in 1962. Appeared on Sesame Street in "Numerosity" presenting 9 lights.
Thudge First appeared in a Christmas sketch on The Ed Sullivan Show in 1967 with Arthur Godfrey. Appeared on Sesame Street in the Numerosity film for the number 5.