B. Cotton was a MACO assigned to Enterprise NX-01 for its mission into the Delphic Expanse between 2153 and 2155.
In 2153, during the takeover of the ship by the Triannons, fellow MACO S. Money wore Cotton's uniform. (ENT: "Chosen Realm")
In May 2154, Cotton served as guard for the brig of Enterprise when Arik Soong was arrested. He was knocked unconscious by Saul when the Augment boarding party entered Enterprise and rescued Soong. (ENT: "Borderland")
A few days later, he guarded Arik Soong again while back on board Enterprise. When the Klingon Bird-of-Prey fired at Enterprise, he was hit by an explosion on the bridge. (ENT: "The Augments")
In November 2154 he was part of the MACO team which led the attack against the Klingon Augments on board Enterprise. (ENT: "Affliction")
B. Cotton was played by regular stunt actor Shawn Crowder, who received no credit for his appearances and who also portrayed Private Carender.