American actor who played Commander Kelby, the engineer who takes over from Tucker aboard Enterprise, in the final run of Star Trek: Enterprise episodes including Bound and Terra Prime.
Derek Magyar is an American actor who joined Star Trek: Enterprise late in its fourth season as Commander Kelby.
Kelby becomes chief engineer of Enterprise after Tucker transfers to Columbia. In Bound he falls under the influence of the three Orion women and sabotages the ship, and in In a Mirror Darkly Magyar plays the character's Terran Empire counterpart. He returns in Terra Prime, where Kelby is suspected when it becomes clear someone aboard is passing information to Paxton's movement.
The role made Kelby one of the few new Starfleet officers added to the ship in the last season, and a foil for Tucker once the latter came back aboard.