File:Q2.png File:Quake3.png Bitterman is the protagonist of Quake 2 and a playable character in Quake 3 Arena. Bitterman is responsible for the success of Operation Alien Overlord, completing the entire operation almost single-handedly, although he did have help from the air forces at various points. Bitterman is one of the most famous protagonists in the Quake series. In his story, he is known by many, including Rhino Squad for his heroism on Stroggos.