Star Trek: The Lionhearted Wiki

Tyler Grant was a Starfleet Command Officer in the 24th century.

Kevin Costner as Tyler Grant

He served aboard theStarbase 76 in 2348 as Flight Operations Officer and became friends withGedna Tachion

By 2371 he held the rank of Captain and commanded the USS Berlin.  That same year he was the senior officer present on a humanitarian mission to Naussica.  ("Meltdown")