Robert Terwilliger, Sr.

Dr. Robert Terwilliger, Sr., also known as Dr. Robert, is Robert and Cecil Terwilliger's father.
== History ==
When Sideshow Bob was put on trial for trying to kill The Simpsons, he claimed that Bob had suffered from an illness caused by his desire to kill Bart Simpson. Bart threw Sideshow Bob's medication out of a window (believing it to be a biological weapon). This subsequently caused Sideshow Bob to "die". In reality, Bob was injected with a death simulation drug by his father prior to the fated trial in order to conduct a complex plan to kill Bart Simpson via locking him in a coffin and cremating him. He, and the rest of the Terwilliger family, were sent to prison afterwards for 87 years.
== Behind the Laughter ==
Robert Terwilliger Sr. was voiced by the late John Mahoney, who also plays the father of the two brothers in Frasier. 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. Kelsey and David also star as Frasier and Niles Crane respectively.
Due to Mahoney's death in 2018, it's safe to assume that he has been retired and will make no future appearances.
== Trivia ==
*He has many similarities with the Mayo Clinic Doctor, such as his face and hair.
*Though Sideshow Bob gets his hairstyle from his mother, he and his father appear to have a similar facial structure.
== Appearances ==
*
*
es:Robert Terwilliger Sr.
fr:Robert Terwilliger Sr.
pt:Robert Underdunk Terwilliger Sr.
ru:Роберт Тервиллигер старший
Category:Criminals
Category:Terwilliger family
Category:Seniors
Category:Male characters
Category:Doctors
Category:Fathers
Category:One-Time Characters
Category:Married
Category:British Characters
Category:Characters voiced by guest stars
Category:Bart's Enemies
Category:Villains
Category:Gray Haired Characters
Category:Attempted Murderers
Category:Attempted Killers
Category:Grandparents
Category:Manics
Category:Tapped Out Characters
Category:Prisoners
Category:Lisa's enemies
Category:Husbands
Category:Season 19 first appearances
Category:Retired Characters
Category:Recurring characters
Category:Homer's enemies
Category:Marge's enemies
Category:Maggie's enemies
Category:American Characters
Category:Surprise villains
Category:Characters that wear Glasses
Category:Sideshow Bob
Category:Tapped Out