Alexander Courage was a Starfleet officer in the 24th century. His planet of origin was Triacus, and as of 2369, he was a commander.

In 2369, he was a crewmember aboard the USS Enterprise-D. He was one of seventeen individuals who were from worlds outside the Federation. His proteins were tested by Doctor Beverly Crusher for a possible configuration match with the fragments of a four-billion-year old genetic program. The results came back negative. (TNG: "The Chase")

This character was only mentioned in writing.
He was named after Alexander Courage, the composer of the Star Trek: The Original Series main theme.
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