In 2270, Corman joined the crew of the shuttlecraft Copernicus along with James T. Kirk, Hikaru Sulu, Nyota Uhura, and Christine Chapel. Their mission was to investigate the source of linguistic signals coming from a pocket universe at the other end of a wormhole in the Huygen cluster. Turbulence knocked Kirk unconscious with a severe concussion, and as ranking mission officer, Uhura assumed command. Corman challenged her authority, saying that she was in operations, not the command division, and wanted to turn the ship back, an argument that was settled when a remote transmission from Spock put her in charge officially.
Corman kept a sour attitude for the rest of the mission, but he ran full sensor sweeps once they were within the pocket universe. He blamed Uhura after gravimetric variances overstressed the shuttle and they were forced to abandon ship in EV suits. Corman maintained a lock on each person's coordinates while Uhura managed to transmit a distress signal with his data to the Enterprise, and all were safely beamed back. Afterward, Corman privately apologized to Uhura for his poor behavior. (TOS - Unlimited comic: "Message in a Bottle")