In 1971, Kasem provided the character voice of Peter Cottontail in the Rankin/Bass production of "Here Comes Peter Cottontail". In the same year, he appeared in "The Incredible 2-Headed Transplant", in what is probably his best-remembered acting role. From 1973 to 1985, Kasem voiced Robin for several "Super Friends" franchise shows. In 1980, he voiced Merry in "The Return of the King". He also voiced Alexander Cabot III on "Josie and the Pussycats" and "Josie and the Pussycats in Outer Space", and supplied a number of voices for "Sesame Street".