|First Episode||The Family That Slays Together, Stays Together (Part I)|
|Voiced By||Toby Huss|
|Profession||Former leader of the OSI|
General Timothy Treister is a member of the executive leadership of O.S.I..
A career military man, General Triester is 77 years old, and has had, by his own recollection, eight heart attacks, and predicts that one of his agents, Brock Samson, will be the cause of the ninth. The pacemaker device in his chest is a result of his multiple heart attacks, but "who's counting?". It is also to be noted that in Mid-Life Chrysalis, after Brock Samson fails his agent's license renewal test, the proctor tears up the failed test, revealing "My father is General Treister. You saved his life. The man spoke of you as a god-and you did not disappoint." Brock then reveals that he had once served as a baby-sitter for the junior Treister.
His most notable accomplishment was to organize a strike force, which came to Samson's rescue, in the Season 3 Finale. A confrontation with Samson at the end of an epic battle between the forces of The Monarch and O.S.I. results in Samson's resignation as a special agent of OSI.
In the season 4 finale "Operation: P.R.O.M." Treister is revealed to have prostate cancer and his x-rays have combine with it causing him to turn into a hulk. This is later revealed to be a lie by two agents who are revealed to be double agents trying to take Triester's place after killing Monstroso. However, Treister was aware of the deception having placed a decoy of the villain and an undercover agent in SPHINX to catch them in the act. He announces his retirement leaving command of the O.S.I. to Hunter Gathers he shoots himself out of orbit via ICBM with a small taped to his chest saying "fix it" in the hope that alien technology will be able to cure him. He was assumed to be dead or in suspended animation.
In "All This and Gargantua-2", Triester's frozen body drifted towards the newly built space station Gargantua 2 where he was discovered by Doctors Jonas Venture Jr. and Billy Whalen who, after studying and doing experiments on him found he had no pulse and considered pulling the plug. However, in the midst of the act Triester's pulse started racing and he awoke and introduced himself. He was overjoyed at having his "pee-pee" cancer cured and mistook the doctors as little green Martians. Thinking that he was being hysterical, they tried to sedate him; but only for him to think they were going to probe him and promptly escape with the group pursuing him. Later on, when the force fields around the space station were sabotaged by the Investors, the Ventures decided to find a way to stop the ship from being destroyed by incoming asteroids. Treister, having calmed down, offered to help them out. When Jonas Jr. and him were trying to get to the station's bridge he found out that the diminutive Venture had cancer. Fed up with cancer, Treister began to grow angry and transformed into an actual Hulk.
With his new powers he aided Jonas Jr. in getting to the bridge and fended off incoming asteroids attacking Rusty and Dean Venture. He later saved the Ventures by ripping off the bridge when the station suffered a meltdown, this allowed Rusty and Dean to be rescued by Brock's group. He was last seen riding on the station as it was piloted by Jonas Jr. into deep space while joyfully exclaiming "Shove it Cancer!!!" before the station exploded and leaving his fate unknown.
- Treister refers to his condition as "pee-pee cancer."
- He is a fan of the rebooted Battlestar Galactica series.
- He has a very unusual taste in codenames.</span>
- His appearance and demeanor combines at least three character from Marvel Comics: General Thunderbolt Ross (mustache and gruff attitude), Colonel Nick Fury (eyepatch and uniform) and Iron Man (his artificial heart).
- In season 6, he becomes an actual Hulk after being exposed to Gamma rays after going through his frozen journey. A Red Hulk just like General Thunderbolt Ross, who was apparently designed after.