Television:
* "The Adventures of Ozzie and Harriet" (1952-1966): Roberts appeared in two episodes of this popular sitcom, marking his early career.
* "Bonanza" (1959-1973): Roberts played the role of "The youngest Cartwright son", "Jim-Edward Cartwright", in this iconic Western series, for four seasons (1959-1963). His departure from the show was controversial, as he sought more creative freedom and felt his character was underutilized.
* "The Man from Atlantis" (1977-1978): Roberts played the lead role of "Mark Harris", a man with the ability to breathe underwater and superhuman strength.
* "Trapper John, M.D." (1979-1986): Roberts played the role of "Dr. Horace 'Harry' Gamble", a surgeon and colleague of the main character.
Movies:
* "The Interns" (1962): Roberts played a medical student in this drama.
* "The Siege of the Alamo" (1960): Roberts played the role of "William Barret Travis".
* "The Ballad of Cable Hogue" (1970): Roberts played the role of "Sam" in this Western film.
* "The Big Valley" (1965): Roberts appeared in a guest role on this popular Western series.
This list doesn't encompass all of his work, but it highlights some of his most significant roles in film and television. Roberts was a talented and respected actor who left a lasting mark on the entertainment industry.