John Mahon (I) More at IMDbPro »

Actor:

• 2000s
• 1990s
• 1980s
• 1970s

1. "Studio 60 on the Sunset Strip" .... George (7 episodes, 2006-2007)
   ... aka "Studio 60" (USA: informal alternative title)
       - K&R: Part 2 (2007) TV episode .... George
       - K&R: Part 1 (2007) TV episode .... George
       - The Disaster Show (2007) TV episode .... George
       - The Harriet Dinner: Part I (2007) TV episode .... George
       - The Christmas Show (2006) TV episode .... George
         (2 more)
2. Zodiac (2007/I) .... Riverside Captain
3. "Enterprise" .... Admiral Gardner (mirror) (1 episode, 2005)
   ... aka "Star Trek: Enterprise" (USA: new title)
       - In a Mirror, Darkly: Part 2 (2005) TV episode .... Admiral Gardner (mirror)
4. "Zoey 101" .... Mr. Bradford (1 episode, 2005)
       - Prank Week (2005) TV episode .... Mr. Bradford
5. "Cold Case" .... Colonel (1 episode, 2004)
       - The Plan (2004) TV episode .... Colonel
6. "Crossing Jordan" (1 episode, 2002)
       - Payback (2002) TV episode
7. "Strange World" .... Agent Milton (1 episode, 2002)
       - The Devil Still Holds My Hand (2002) TV episode .... Agent Milton
8. Just Ask My Children (2001) (TV) .... Judge Ferguson
9. "The Division" .... Barry Constansas (1 episode, 2001)
   ... aka "Heart of the City"
       - What Sharp Teeth You Have (2001) TV episode .... Barry Constansas
10. "That's Life" .... Leo (1 episode, 2001)
        - Touched by a Biker (2001) TV episode .... Leo
11. "JAG" (1 episode, 2000)
    ... aka "JAG: Judge Advocate General" (Australia)
        - A Separate Peace: Part 2 (2000) TV episode
12. "Bull" .... Paul Catteo (1 episode)
        - What the Past Will Bring (????) TV episode .... Paul Catteo
13. "Touched by an Angel" .... Wally (1 episode, 2000)
        - A Clown's Prayer (2000) TV episode .... Wally
14. "Angel" .... Trevor Lockley (2 episodes, 1999-2000)
    ... aka "Angel: The Series" (USA: long title)
        - The Prodigal (2000) TV episode .... Trevor Lockley
        - Sense and Sensitivity (1999) TV episode .... Trevor Lockley
    
    
15. "Just Shoot Me!" .... Alan Drake (1 episode, 1999)
        - Blackmail Photographer (1999) TV episode .... Alan Drake
16. "Arli$$" (1 episode, 1999)
        - You Gotta Love This Game (1999) TV episode
17. Austin Powers: The Spy Who Shagged Me (1999) .... NATO Colonel
    ... aka Austin Powers 2: The Spy Who Shagged Me (USA: video title)
18. "The X Files" .... General Wegman (2 episodes, 1998)
    ... aka "The X-Files" (USA)
        - Dreamland II (1998) TV episode .... General Wegman
        - Dreamland (1998) TV episode .... General Wegman
19. "Diagnosis Murder" .... Fire Chief (1 episode, 1998)
        - Resurrection: Part 1 (1998) TV episode .... Fire Chief
20. Armageddon (1998/I) .... Karl
21. "Frasier" .... Uncle Walter 'Walt' Crane (1 episode, 1998)
        - Beware of Greeks (1998) TV episode .... Uncle Walter 'Walt' Crane
22. "The Pretender" .... Eugene Clark (1 episode, 1998)
        - A Stand-Up Guy (1998) TV episode .... Eugene Clark
23. "Brooklyn South" .... Gene Donovan (1 episode, 1998)
        - Dead Man Sleeping (1998) TV episode .... Gene Donovan
24. L.A. Confidential (1997) .... Police Chief
25. "Profiler" .... Det. Spitz (1 episode, 1997)
        - Blue Highway (1997) TV episode .... Det. Spitz
26. The American President (1995) .... Chairman of the Joint Chiefs
27. Roswell (1994) (TV) .... Red Hat Vet
    ... aka Incident at Roswell (Australia: video title)
    ... aka Roswell: The U.F.O. Cover-Up (USA: video title)
28. Natural Selection (1994) (TV) .... Coach Dickler
    ... aka Dark Reflection
29. Lifepod (1993) (TV)
30. "Space Rangers" .... Amb. Hardcastle (1 episode, 1993)
        - Death Before Dishonor (1993) TV episode .... Amb. Hardcastle
31. Sinatra (1992) (TV) .... Mr. Cleaves
32. "Homefront" .... Bus Driver (1 episode, 1992)
        - When the Stars Begin to Fall (1992) TV episode .... Bus Driver
33. Final Shot: The Hank Gathers Story (1992) (TV) .... LMU Coach
34. Murder Without Motive: The Edmund Perry Story (1992) (TV) .... Inspector Hedges
    ... aka Best Intentions
35. One False Move (1992) .... Chief Jenkins
36. "Flesh 'n' Blood" .... Holly's Dad (1 episode, 1992)
        - Love Is a Many Splendored Thing (1992) TV episode .... Holly's Dad
37. The People Under the Stairs (1991) .... Police sergeant
    ... aka Wes Craven's The People Under the Stairs
38. "Knots Landing" .... Investigator / ... (3 episodes, 1990)
        - The Fan Club (1990) TV episode .... Investigator
        - Wrong for Each Other (1990) TV episode .... Superior
        - The Grim Reaper (1990) TV episode .... Surveillant
39. "Jake and the Fatman" (1 episode, 1990)
        - You Took Advantage of Me (1990) TV episode
40. "Mancuso, FBI" (1 episode, 1990)
        - Adamant Eve (1990) TV episode
41. Bad Influence (1990) .... Dr. Fielding
42. "Dallas" .... Captain Holgar (1 episode, 1990)
        - A Tale of Two Cities (1990) TV episode .... Captain Holgar
    
    
43. "Baywatch" .... Arnold Anderson (1 episode, 1989)
    ... aka "Baywatch Hawaii" (USA: new title)
        - The Cretin of the Shallows (1989) TV episode .... Arnold Anderson
44. "Hunter" (1 episode, 1989)
        - Shoot to Kill (1989) TV episode
45. Midnight Train to Moscow (1989) (TV)
    ... aka Billy Crystal: Midnight Train to Moscow (USA)
46. Shakedown on the Sunset Strip (1988) (TV) .... Deputy Chief Evans
47. The Couch Trip (1988) .... Police Captain
48. "Hooperman" .... Chapell (1 episode, 1987)
        - Aria da Capo (1987) TV episode .... Chapell
49. Six Against the Rock (1987) (TV) .... Officer Bill Miller
50. Convicted: A Mother's Story (1987) (TV)
51. "Mike Hammer" (1 episode, 1986)
    ... aka "Mickey Spillane's Mike Hammer" (USA: complete title)
    ... aka "The New Mike Hammer" (USA: new title)
        - Dead Pigeon (1986) TV episode
52. "Stingray" .... Desk Sgt. (1 episode, 1986)
        - Sometimes You Gotta Sing the Blues (1986) TV episode .... Desk Sgt.
53. Betrayed by Innocence (1986) (TV) .... Bailiff
    ... aka Jailbait: Betrayed by Innocence (USA: video title)
54. "Hill Street Blues" .... Detective McConnell / ... (2 episodes, 1985-1986)
        - Say It as It Plays (1986) TV episode .... Mario
        - Dr. Hoof and Mouth (1985) TV episode .... Detective McConnell
55. "MacGyver" .... Vendor (1 episode, 1985)
        - The Prodigal (1985) TV episode .... Vendor
56. "Knight Rider" .... Alfie Girdler (1 episode, 1985)
        - Knight Racer (1985) TV episode .... Alfie Girdler
57. "Misfits of Science" .... M.P. (1 episode, 1985)
        - Guess What's Coming to Dinner (1985) TV episode .... M.P.
58. "Simon & Simon" .... Minister (1 episode, 1985)
        - Love and/or Marriage (1985) TV episode .... Minister
59. "T.J. Hooker" .... Mr. Zewecki (1 episode, 1985)
        - The Chicago Connection (1985) TV episode .... Mr. Zewecki
60. "St. Elsewhere" .... Police Officer (1 episode, 1985)
        - Cheers (1985) TV episode .... Police Officer
61. Victims for Victims: The Theresa Saldana Story (1984) (TV)
    ... aka Victims for Victims
62. "Cagney & Lacey" .... DPA Clerk (1 episode, 1984)
        - Baby Broker (1984) TV episode .... DPA Clerk
63. "Automan" .... Policeman (1 episode, 1984)
        - Zippers (1984) TV episode .... Policeman
64. "Scarecrow and Mrs. King" (1 episode, 1984)
        - Remembrance of Things Past (1984) TV episode
65. "Manimal" .... Man (1 episode, 1983)
        - Breath of the Dragon (1983) TV episode .... Man
    
    
66. Someone's Watching Me! (1978) (TV) .... Frimsin
    ... aka High Rise
67. "Kojak" .... I.A.D. Man (1 episode, 1978)
        - The Captain's Brother's Wife (1978) TV episode .... I.A.D. Man
68. A Killing Affair (1977) (TV) .... Det, Shoup
    ... aka Behind the Badge
69. "The Rockford Files" .... Lt. Hayes / ... (3 episodes, 1976-1977)
    ... aka "Jim Rockford, Private Investigator" (USA: syndication title)
        - There's One in Every Port (1977) TV episode .... Victor Sherman
        - Return to the 38th Parallel (1976) TV episode .... Lt. Hayes
        - Foul on the First Play (1976) TV episode .... Todd Morris
70. "The Blue Knight" .... SWAT Commander (1 episode, 1976)
        - To Kill a Tank (1976) TV episode .... SWAT Commander
71. Collision Course: Truman vs. MacArthur (1976) (TV) .... Gen. Hoyt Vandenburg
    ... aka Collision Course (USA: short title)
72. The Exorcist (1973) (uncredited) .... Language Lab Director
    ... aka The Exorcist 2000 (Australia: cable TV title)
    ... aka The Exorcist: The Version You Haven't Seen Yet (USA: recut version)
    ... aka The Exorcist: The Version You've Never Seen (USA: promotional title)
    ... aka William Peter Blatty's The Exorcist (USA: reissue title)
    

Self:

1. A Call to Arms (2009) .... Major General Cosgrove USMC