Actor:
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1. The Twilight Zone (1959), series...Anthony Fremont
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2. Tammy Tell Me True (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), series...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. Papillon (1973), film...Lariot
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10. Biography (1987), series...Self - Narrator
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11. Captain America (1990), film...Young General Fleming
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12. The Flash (1990), series...Roger Braintree
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13. Double Trouble (1992), film...Bob
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14. Babylon 5 (1993), series...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), series...Self - Narrator
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18. Babylon 5: The Road Home (2023), film...Lennier (voice)
Voice:
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1. Babylon 5: The Road Home (2023), film...Lennier
Writer:
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2. The Twilight Zone (2002), series...(story by)
Narrator:
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1. E! True Hollywood Story (1996), series