(written from a Production point of view)
Stephen Blackehart (born 1 December 1967; age 47) is an actor who had two different background parts in the Star Trek: Deep Space Nine episode "The Dogs of War". He portrayed a Cardassian civilian during the bomb attack sequence and appeared as a Starfleet science officer aboard the USS Sao Paulo. The latter one was dubbed "Lieutenant Pa'ak" by Blackehart.  Three years later in 2002, Blackehart appeared as a Risian in a first season episode of Star Trek: Enterprise. For this appearance he filmed his scenes on Wednesday 27 March 2002 on Paramount Stage 9. He received no credit for his appearances.
Blackehart is best known for his roles in films such as Retro Puppet Master, Rockabilly Vampire, and The Ghouls.