On the small screen, Katt made his debut as star of the fantasy series "The Greatest American Hero" (ABC, 1981-83), playing a mild-mannered school teacher who is endowed with super human powers when he dons a special costume. He received kudos for his sensitive portrayal of a retarded young man in the TV-movie "The Rainmaker" (1982) before co-starring with his mother, Barbara Hale, in a series of Perry Mason TV-movies beginning with "Perry Mason Returns" (1985) and seven follow-ups in which he played Paul Drake, Jr., offspring of Perry's personal private investigator (William Hopper).