He played a cadet (ah, can't remember his name) who was a fourth year cadet. He and Wesley Crusher were on a StarFleet Academy Flight team (or something similar to that) when Crusher was a first year. This occurred in Season Five of The Next Generation Series.
He was the one for the cover up. Amazingly the character and story go very well with the Tom Paris character from the First Voyager Episode (the premiere of Voyager is one of my favorites of all the Star Trek shows). Unfortunately Tom Paris changed his personality after the premier to a much more obedient, docile, and boring personality for the rest of Voyager. They could have even perhaps kept the Same Character name from TNG with the characterization that they gave Tom Paris, but instead decided to keep the basic character profile and make a new character for Voyager, the character called Tom Paris of course.
The episode was First Duty, episode 219, the character played, Nick Locarno I believe.