Nothing is known about Gabe's life before the apocalypse.
Gabe is seated behind the Trimbol family during Charlene's memorial service, listening to the different speeches. After the the service, Gabe is having breakfast with Terrance and other kids outside. Later, Gabe joins Gretchen, Alicia, Terrance, and other kids to the underground hangout spot where they drink, smoke from a bong, and talk. He listens intently as Alicia shares her experiences outside the ranch. Later that evening, Gabe and the others return to the main part of the ranch in good spirits.
Gabe is gathered at the front gate with Terrance and the other ranch residents as Madison, Jeremiah, and Nick reveal that the entire Trimbol family had been killed by the Native Americans. Gabe is very upset at the loss of his friend, Gretchen.
At night, Gabe is with Cooper, Blake and several others as they sneak into Nick's house and thanks them for standing up for them, referring to the standoff he and Troy were involved in. Gabe and the others inform Nick that they are willing to remain in the militia and fight if necessary. The next night, he is with the militia sympathizers again and listens to Cooper as he tries to persuade Nick to stand up and lead the fight against the Natives. The following night, he sharpens a blade as Cooper and Nick decide what their next move should be. In the morning, Gabe is the among the ranchers to be discreetly collecting weapons in an attempt to overthrow the Natives. He is among the militia to sneak up to Ofelia's cabin, but follows Nick to the dig site and help dig for water.
Gabe is among the ranchers and Natives to help defend the RV wall from the horde in an attempt to protect the ranch community. As Gabe fights off a zombie that crawled under the RV, Blake runs over to help him. When the zombies break in, he is among those to have been killed as he is not seen in the underground pantry with the remaining residents.
Gabe is among those killed by zombies when they break through the RV wall.