Here's a list of Notable TV Guest Appearances Tom Atkins has made. Information from IMDB.com.

1. "Jury, The" (2004) playing "Boyd Kingman" in episode: "Mail Order Mystery" (episode # 1.3) 15 June 2004

2. "Law & Order: Criminal Intent" (2001) playing "Mr. Monahan" in episode: "Cold Comfort" (episode # 2.17) 30 March 2003

3. "Homicide: Life on the Street" (1993) playing "Grenville Rawlins" in episode: "The Twenty Percent Solution" (episode # 7.4) 30 October 1998

4. "Xena: Warrior Princess" (1995) playing "Atrius" in episode: "The Furies" (episode # 3.1) 29 September 1997

5. "Xena: Warrior Princess" (1995) playing "Atreus" in episode: "Ties That Bind" (episode # 1.20) 29 April 1996

6. "Walker, Texas Ranger" (1993) playing "Wade Cantrell" in episode: "Night of the Gladiator" (episode # 2.10) 11 December 1993

7. "Equalizer, The" (1985) playing "Detective Frank Standish" in episode: "Blood & Wine: Part 2" (episode # 3.2) 23 September 1987

8. "Equalizer, The" (1985) playing "Detective Frank Standish" in episode: "Blood & Wine: Part 1" (episode # 3.1) 23 September 1987

9. "Spenser: For Hire" (1985) playing "Hatch" in episode: "White Knight" (episode # 2.3) 18 October 1986

10. "Equalizer, The" (1985) in episode: "Pretenders" (episode # 1.22) 8 April 1986

11. "Stingray" (1986) playing "Donald Dixon" in episode: "Sometimes You Gotta Sing the Blues" (episode # 1.4) 8 April 1986

12. "Alfred Hitchcock Presents" (1985) in episode: "Beast in View" (episode # 1.13) 19 January 1986

13. "Fall Guy, The" (1981) playing "George Spiros" in episode: "The Skip Family Robinson" (episode # 4.22) 6 March 1985

14. "T.J. Hooker" (1982) playing "Phil Parker/Tommy D'Amico" in episode: "Hooker's Run" (episode # 3.16) 4 February 1984

15. "St. Elsewhere" (1982) in episode: "Dog Day Hospital" (episode # 1.18) 22 March 1983

16. "Quincy" (1976) playing "Commander Gene Butler" in episode: "The Last of Leadbottom" (episode # 7.22) 28 April 1982

17. "M*A*S*H" (1972) playing "Major Weems" in episode: "The Tooth Shall Set You Free" (episode # 10.14) 8 February 1982

18. "Lou Grant" (1977) playing "Dr. Sorenson" in episode: "Drifters" (episode # 5.7) 14 December 1981

19. "Lou Grant" (1977) playing "Jim Bronsky" in episode: "Strike" (episode # 4.13) 16 February 1981

20. "Lou Grant" (1977) playing "Frank Durning" in episode: "Fire" (episode # 2.13) 8 January 1979

21. "Baretta" (1975) in episode: "It Goes with the Job" (episode # 4.10) 21 December 1977

22. "Visions" (1976) playing "Robert Dayka" in episode: "Pennsylvania Lynch" (episode # 1.8) 9 December 1976

23. "Rookies, The" (1972) in episode: "Lamb to the Slaughter" (episode # 4.1) 9 September 1975

24. "Rhoda" (1974) playing "Vic Rhodes" in episode: "Pop Goes the Question" (episode # 1.6) 14 October 1974

25. "Get Christie Love" (1974) in episode: "Market for Murder" (episode # 1.1) 11 September 1974