Actor:
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1. The Six Million Dollar Man (1974), series...Diver
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2. Little Women (1978), film...Frank Vaughn
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3. Loving Couples (1980), film...Alan
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4. The Thorn Birds (1983), series...Alastair MacQueen
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5. Houston: The Legend of Texas (1986), film...John Van Fossen
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6. Star Trek: TNG (1987), series...Q
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7. Bad Influence (1990), film...Howard
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8. Taking Care of Business (1990), film...Ted
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...Dr. Victor Mott
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10. Fearless (1993), film...Jeff Gordon
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11. Tamno crveno (1994), film...Thomas Newmeyer
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12. Multiplicity (1996), film...Ted
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13. Raven Hawk (1996), film...Stansfield
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14. Final Descent (1997), film...Capt. George W. Bouchard
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15. You Lucky Dog (1998), film
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16. Final Run (1999), film...George Bouchard
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17. Border Line (1999), film...Rolf Berger
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18. Woman on Top (2000), film...Alex Reeves
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19. Max Steel (2000), series...L'Etranger
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20. Good Advice (2001), film...Ted
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21. Zlatno doba (2002), film...Vaughn Clay
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22. Darklight (2004), film...Faith Director Chapel
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23. The Eavesdropper (2004), film...Dr. Gene Kramer
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24. Reign Over Me (2007), film...Nigel Pennington
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25. Pathology (2008), film...Dr. Quentin Morris
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26. My Apocalypse (2008), film...Nathan Eastman
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27. Crank 2: High Voltage (2009), film...Fish Halman
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28. Gamer (2009), film...Chief of Staff
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29. You (2009), film...Dick
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30. The Captains (2011), film...Self
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31. Cloned: The Recreator Chronicles (2012), film...Dr. Frank Miller / Frank 2
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32. Chaos on the Bridge (2014), film
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33. Visions (2015), film...Victor Napoli
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...Self
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35. Buttons: A Christmas Tale (2018), film...Doctor Johnson
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36. Star Trek: Picard (2020), series...Q
Producer:
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1. Return to Area 51 (2002), film
Voice:
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1. Saving Private Ryan (1998), film...Letter-Reader
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2. My Little Pony: Friendship Is Magic (2010), series...Discord
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3. Olaf's Frozen Adventure (2017), film...Mr. Olsen
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...Discord
Narrator:
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1. National Geographic Explorer (1985), series
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2. Return to Area 51 (2002), film