Notable television roles include Jake Clampett (a deadbeat who mooches off the Clampetts) for two episodes of CBS's The Beverly Hillbillies, Blanche Morton's (Bea Benaderet's) brother Roger Baker on eight episodes of The George Burns and Gracie Allen Show, and Harvey Helm in a 17-episode stint on NBC's The Bob Cummings Show.
 Donovan also appeared in six episodes as Chris Norman of It's a Great Life, a sitcom with Frances Bavier, James Dunn and Michael O'Shea, which aired on NBC from 1954 to 1956.
 About this time, he also guest starred on Ray Bolger's ABC sitcom, Where's Raymond?
and the NBC sitcom, The People's Choice, with Jackie Cooper.
 He also guest starred on the David Janssen crime drama, Richard Diamond, Private Detective.
 In 1956 he appeared as Joe Baker on the TV western Cheyenne in the episode titled "Mustang Trail."
He played Mark Dawson in the 1959 Maverick episode "Maverick Springs".
 He was also in Wanted: Dead or Alive in the 1959 episode "Bad Gun" as the gun dealer Sheridan Appleby, in which he tries to recover a defective pistol that he had sold to an outlaw.
 He and Steve McQueen rescue a kidnapped senator's daughter when the faulty firearm explodes in the face of the bad guy.

Donovan guest starred as Paddy Britt in the 1960 episode "The Boy from Pittsburgh" of the NBC western series, Riverboat, starring Darren McGavin and Burt Reynolds and set in the 1840s.
Child actor Tom Nolan was cast in the title role as Tommy Jones, a stowaway on the vessel, the Enterprise.
In the story line, series lead character Grey Holden (McGavin) transports a box of diamonds, unknowing that a pickpocket has taken the gems and switched the contents of the box.
Mona Freeman appeared in this episode as Louise Rutherford, a beautiful widow, with other roles for the character actors Francis De Sales and Robert Emhardt.

In 1963, he played the part of Poke Tolliver in the episode "Incident of the Buryin' Man" on CBS's Rawhide.
Between 1965 and 1967, Donovan had a recurring role as neighbor Herb---whose mission in life seemed to be getting from his house through the study window of professor Jim Nash in less than a full minute---on the situation comedy Please Don't Eat the Daisies.
Notable television roles include Jake Clampett (a deadbeat who mooches off the Clampetts) for two episodes of CBS's The Beverly Hillbillies, Blanche Morton's (Bea Benaderet's) brother Roger Baker on eight episodes of The George Burns and Gracie Allen Show, and Harvey Helm in a 17-episode stint on NBC's The Bob Cummings Show.  Donovan also appeared in six episodes as Chris Norman of It's a Great Life, a sitcom with Frances Bavier, James Dunn and Michael O'Shea, which aired on NBC from 1954 to 1956.  About this time, he also guest starred on Ray Bolger's ABC sitcom, Where's Raymond? and the NBC sitcom, The People's Choice, with Jackie Cooper.  He also guest starred on the David Janssen crime drama, Richard Diamond, Private Detective.  In 1956 he appeared as Joe Baker on the TV western Cheyenne in the episode titled "Mustang Trail." He played Mark Dawson in the 1959 Maverick episode "Maverick Springs".  He was also in Wanted: Dead or Alive in the 1959 episode "Bad Gun" as the gun dealer Sheridan Appleby, in which he tries to recover a defective pistol that he had sold to an outlaw.  He and Steve McQueen rescue a kidnapped senator's daughter when the faulty firearm explodes in the face of the bad guy.
Donovan guest starred as Paddy Britt in the 1960 episode "The Boy from Pittsburgh" of the NBC western series, Riverboat, starring Darren McGavin and Burt Reynolds and set in the 1840s. Child actor Tom Nolan was cast in the title role as Tommy Jones, a stowaway on the vessel, the Enterprise. In the story line, series lead character Grey Holden (McGavin) transports a box of diamonds, unknowing that a pickpocket has taken the gems and switched the contents of the box. Mona Freeman appeared in this episode as Louise Rutherford, a beautiful widow, with other roles for the character actors Francis De Sales and Robert Emhardt.
In 1963, he played the part of Poke Tolliver in the episode "Incident of the Buryin' Man" on CBS's Rawhide. Between 1965 and 1967, Donovan had a recurring role as neighbor Herb---whose mission in life seemed to be getting from his house through the study window of professor Jim Nash in less than a full minute---on the situation comedy Please Don't Eat the Daisies.
King Donovan