Igralec:
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1. Obmocje somraka (1959), serija...Anthony Fremont
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2. DIMMI LA VERITA' (1961), film...Neil Bateman (uncredited)
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3. Sammy, the Way-Out Seal (1962), film
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4. A Child Is Waiting (1963), film...Boy Counting Jean's Pearls
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5. Erasmus with Freckles (1965), film...Erasmus 'Ras' Leaf
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6. Lost in Space (1965), serija...Will Robinson
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7. Rascal (1969), film...Sterling North
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8. Bless the Beasts & Children (1971), film...Teft
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9. Metulj (1973), film...Lariot
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10. Biography (1987), serija...Self - Narrator
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11. Captain America (1990), film...Young General Fleming
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12. The Flash (1990), serija...Roger Braintree
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13. Double Trouble (1992), film...Bob
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14. Babylon 5 (1993), serija...Lennier
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15. Shockwave (2006), film...Major Heath
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...Self - Narrator
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17. Toon in with Me (2021), serija...Self - Narrator
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18. Babylon 5: The Road Home (2023), film...Lennier (voice)
Glas:
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1. Babylon 5: The Road Home (2023), film...Lennier
Scenarist:
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2. The Twilight Zone (2002), serija...(story by)
Pripovjedač:
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1. E! True Hollywood Story (1996), serija