The first episode of Red vs. Blue introduces the main characters, and poses the all-important question, why are we here?

The Reds get a new piece of equipment, and Grif has a problem with its name.

The Red and Blue armies get new recruits.

Caboose is given the job of "guarding the flag". Donut goes to the store.

Donut returns from the store with a surprise.

The Blues go through the teleporter. The Reds get the upper hand.

While Church and Tucker lament their current situation, Caboose hops into the tank.

Grif and Simmons flee as Caboose's trigger happy firing has dire consequences.

The cavalry arrives, and Caboose gets stuck.

Tucker requests reinforcements, and gets more than he bargained for.

Tex assaults the Red Base, injuring donut and knocking out Grif and Simmons.

Church reveals that Tex was his former girlfriend and the Red Team airlifts a severely injured Donut back to headquarters.

Simmons and Grif guard Tex while Church explains to the Blues about Tex's AI.

The Blues fake an attack on the Reds in order to free Tex and inadvertently get Sarge shot in the head.

Sarge and Church meet up in the spirit world and talk about the afterlife until Sarge is revived by Grif.

Donut returns with new armor, and Lopez finally speaks.

The origin points here.

Church tries to warn the Red Team of Tex's impending attack.

The final episode of Red vs. Blue season one.

Three months after Tex's second attack on the Red Base, Medical Officer DuFresne ("Doc") arrives in Blood Gulch and contacts Blue Command for orders. He reports to the Blue Team to treat Tex, who has already died.[2] Church explains this to Doc, noting how his and Tex's bodies are both buried in front of Blue base. More helpfully, Caboose conveniently recaps the first season, explaining that Church is actually a ghost possessing Lopez's robot body, which has since been spray-painted cobalt. Caboose has also apparently begun to habitually utter death threats to Tucker in a deep, menacing voice. With nobody injured, Doc, on loan to both armies due to a lack of resources, prepares to visit the Red Team next, but the Reds suddenly attack.

With the Reds continuing their attack, Church and Tucker argue over defense strategy. Despite his protest that he is only a medic, DuFresne is officially nicknamed "Doc" by Church, who coerces him into helping by shooting Caboose's pinky toe. Meanwhile, the Reds run out of ammunition, due to Grif's failure to bring extra rounds, and consequently try to bluff the Blues into surrendering.

The two teams negotiate terms. The Reds demand Lopez's return, but Church is loath to surrender his new body; instead, he cedes Doc as a hostage. In return, Grif is forced to publicly humiliate himself, to the delight of all, particularly Sarge.

In order to repair Sheila, Church and Tucker try to determine how to activate the repair sequence in Church's robot body. Church only manages to find the time and temperature function, but Tucker discovers a small switch on Church's crotch. When flipped, it activates a strange beeping noise audible only to Church. Back at the Red Base, the Warthog begins to beep, and announces that its homing beacon has been activated.

Sarge reveals that he had put a remote control in the Warthog to allow Lopez to drive it remotely. Meanwhile, Church, who cannot stand the remote's beeping sound, begs Tucker and Caboose to deactivate it, but the switch breaks. While the other Blues continue trying to help, Church unwittingly causes the Warthog to scoop up Doc and then to attempt to kill Sarge. Having pinned the latter against the wall of Red Base, the Warthog slowly advances its firing machine gun toward his head as the episode ends.

Tucker disconnects the wire that had connected to Church's switch, thereby stopping the beeping noise, but also disabling Church's legs. The Warthog deactivates, sparing Sarge. Driving the Warthog, Doc attempts to unpin Sarge, but only manages to ram him into the wall twice more, and the Reds consequently decide to return him to the Blues. When Simmons and Grif arrive at the Blue Base, they see Tucker still kneeling in front of Church attempting to repair his legs, and quickly jump to conclusions.