In the Babylon 5 universe, a human member of the Anla'shok. Played by Jason Carter.

Marcus came to the B5 station in 2260, and acted as a bridge officer and interpreter on the first White Star. He was a proficient fighter with the denn'bok, an excellent pilot, and possessed a quick wit.

Marcus secretly had a crush on Susan Ivanova. As such, when she was mortally injured in 2261, Marcus used the life energy transfer device to save her life at the expense of his own.