Donald Sage Mackay (born 12 July 1964; age 61) is an actor who played Shilat in the Star Trek: Enterprise first season episode "Oasis". He received no screen credit for this part. He filmed his scenes for this episode between Monday 28 January 2002 and Friday 1 February 2002 on Paramount Stage 8, 9, and 18.
Mackay is a stage and television actor who appeared in television series such as ER (2000, starring Eriq La Salle, with Alan Dale), The District (2001, starring Lynne Thigpen and Roger Aaron Brown, with Beau Billingslea, Vinny Argiro, James Parks, David L. Crowley, and Richard Fancy), Malcolm in the Middle (2003, with Kenneth Mars and Benjamin Livingston), JAG (2003, with K Callan, Steven Culp, and Marco Rodriguez), Frasier (2003, starring Kelsey Grammer, with Patrick Stewart and Caroline Lagerfelt), The West Wing (2003, starring Martin Sheen, with Gary Cole, J. Patrick McCormack, Steven Culp, and Timothy Davis-Reed), and House (2007, starring Jennifer Morrison, with Vyto Ruginis). He had recurring roles in Providence (2001), Scrubs (2002-04, starring Ken Jenkins), and Passions (2001-06).
Mackay played supporting roles in films such as Desert Saints (2002, stunt coordinated by Lou Simon) and The Story of Bob (2005), and lent his voice to The Swan Princess: Escape from Castle Mountain (1997) and The Swan Princess III: The Mystery of the Enchanted Kingdom (1998, co-starring Steve Vinovich in both).