Unlike most of the Neb crew, Dozer and his brother Tank are natural-born humans from the city of Zion. Dozer fills a dual role aboard the Nebuchadnezzar as both its pilot and its medic. Since he was not produced by the Machines in their human farms, he cannot plug into the Matrix.
When Cypher betrays the Neb crew, he jacks out of the Matrix and then uses a lightning rifle to attack Tank. After witnessing his brother's apparent murder, Dozer lunges at Cypher only to be struck down himself.