(written from a Production point of view)
Angus McClellan is an actor who appeared as a Starfleet officer in several episodes of Star Trek: Deep Space Nine. He received no credit for his appearances and was identified by fellow actor Randy James. McClellan and James both worked on the science ficition series Roswell on which McClellan was the stand-in for lead actors Brendan Fehr and Adam Rodriguez as well as a recurring background actor.
(This list is currently incomplete.)