Jack R. Orend is the actor who played 0413 Theta, a Terran slave in the Star Trek: Deep Space Nine second season episode "Crossover".
Orend started his acting career in 1979 when he portrayed a weary worker in Dummy along Paul Sorvino, LeVar Burton, and Gregg Henry, followed by supporting roles in The Blues Brothers (1980), Chicago Story (1981, with Michael Horton) and Skokie (1981, with John Rubinstein), Big Shots (1987, with Robert Joy and Paul Winfield), The Heist (1989, with Wendy Hughes and Noble Willingham), and An Innocent Man (1989, with F. Murray Abraham).
He portrayed the recurring role of Dwight in the television series General Hospital (1981) and made guest appearances in L.A. Law (1988, with Corbin Bernsen, Larry Drake, Joel Brooks, George Coe, Nancy Vawter, and Michael Keenan), Knots Landing (1990, with Michelle Phillips and Marco Sanchez), Quantum Leap (1992, starring Scott Bakula and Dean Stockwell and with Vaughn Armstrong), and The Adventures of Brisco County, Jr. (1993, with Tony Jay and Mark Bramhall).
Further film credits include F/X2 (1991, with Leland Crooke and Biff Yeager), The Heroes of Desert Storm (1991, with Wren T. Brown, Michael Champion, Donald Hotton, Ben Lemon, Glenn Morshower, Jocelyn O'Brien, Tim Russ, and Raymond Singer), Amityville: A New Generation (1993, with Terry O'Quinn, Robert Rusler, and Tom Wright), Casino (1995), and Denial (1998, with Jason Alexander, Hudson Leick, Nicholas Worth, Shelly Desai, and Steve Schirripa).
More recently, Orend appeared in ER (1998, with Robert Knepper, Lily Mariye, and Brooke Stephens), Timecop (1998, with Don Stark and Michael Kagan), FreakyLinks (2000, with Ron Canada), Charmed (2001, with Michael Bailey Smith and Dorenda Moore), The District (2003, with Melinda Clarke, Pancho Demmings, Michael Spound, and Daniel Roebuck), and Miracles (2003, with Spencer Garrett, Wendy Schenker, and Mark L. Taylor), voiced Cilix in the video game Emperor: Battle for Dune (2002, along Michael Bell, Eugenie Bondurant, Hamilton Camp, Michael Dorn, Kay E. Kuter, Vincent Schiavelli, Iona Morris, Michael Bailey Smith, Adrian Sparks, Musetta Vander, and Nicholas Worth), and portrayed featured characters in IOWA (2005, with John Savage) and Wasting Away (2007, with Chris Antonucci, Colby French, Richard Riehle, and Tracey Walter).