Robert Terwilliger, Sr.

Robert Underdunk Terwilliger Sr. is Sideshow Bob's father.

Role in episode
When Sideshow Bob was put on trial for trying to kill The Simpsons Bart threw Sideshow Bob's medacation out the window and caused Sideshow Bob to die. However, he revived Sideshow Bob by injecting his medication through his neck.

Trivia
He is voiced by John Mahoney who is the father of the two brothers in Fraizer. The two brothers are voiced by Kelsey Grammer and David Hyde Pierce the voice actors of Sideshow Bob and Cecil Terwilliger who are brothers in The Simpsons.