For additional meanings of "Marcus", please see Marcus.

Crewman Marcus was a security officer aboard the USS Enterprise-D.

In 2367, when Admiral Norah Satie was aboard the ship, Ensign Bailey was ordered by security chief Worf to track crewman Simon Tarses' movements for the previous five years when he was on trial and work with Marcus on this task. (TNG: "The Drumhead")

This character was only mentioned in dialogue.
Marcus was only mentioned and did not appear in the episode.
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