He was the central character in three sitcoms: Doc, which ran on CBS from 1975–77, where he played a physician; Mr. Merlin, in which he played Merlin, a magician mentoring a 20th-century teenager; and The Cavanaughs, co-starring Christine Ebersole, in which he played the family patriarch (Art Carney played his brother, and Glynis Johns made guest appearances).