(written from a Production point of view)
Aldric A. Horton is an actor who was one of the regular background performers during the four year run of Star Trek: Enterprise, mostly playing an operations division Starfleet officer. In one episode he appeared as a background Xindi-Arboreal, indicated by the name tag of his costume which was sold off on the Christie's auction 40 Years of Star Trek: The Collection.  A still image of Horton from the episode "Vox Sola" can be seen in the ENT Season 1 DVD special Cast Impressions: Season One. As a background actor, Horton received no credit for his appearances.
Horton portrayed as a palace guard in the 2004 comedy film The Princess Diaries 2: Royal Engagement (with John Rhys-Davies, Chris Pine, Elinor Donahue, Chris Wynne, Neal Kaz, and stunts by Charlie Brewer, Kevin Derr, Dana Dru Evenson, and Andy Gill) and had supporting roles in Michael Mann's drama Ali (2001), Barry Sonnenfeld's science fiction comedy Men in Black II (2002, with Jack Kehler, Michael Rivkin, Michael Bailey Smith, Mary Stein, Paige Brooks, Kevin Grevioux, Derek Mears, and Shannon Watson), and the independent films Out of the Shadows and Full Circle.
(This list is currently incomplete.)