MIchael Ensign portrayed Ross's boss at the natural history museum, Dr. Donald Ledbetter. Ensign has had a long film and television career which includes roles on Boston LegalAliasMonkJAGCSI: Crime Scene InvestigationStar Trek: EnterpriseThe X FilesStar Trek: VoyagerStar Trek: Deep Space NineStar Trek: The Next GenerationMacGyverDynastyFalcon CrestM*A*S*H, The A-Team, and The Dukes Of Hazzard. Ensign's film credits include Superman (1978), Pink Floyd – The Wall (1982), WarGames (1983), Ghostbusters (1984), Dr. Hackenstein (1988), TitanicSolaris (2002), and Seabiscuit (2003).

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