Louis Mustillo is Phil, Jerry's neighbor in The Strongbox (Season 9 Episode 14).
Marc Hirschfeld is Tennis Crowd in The Lip Reader (Season 5 Episode 7) and a Business Man in The Puerto Rican Day (Season 9 Episode 20).
Marcelo Tubert is Father in The Puerto Rican Day (Season 9 - Episode 22).
Marco Rodríguez is Guillermo in The English Patient (Season 8 Episode 17).
Mario Joyner is Lamar in The Puerto Rican Day (Season 9 - Episode 20) and himself in The Engagement (Season 7 - Episode 1).
Mark Beltzman is Bob, a chef and a suit buyer in The Pie (Season 5 Episode 15).
Mark Christopher Lawrence is the the skycap in The Airport Season 4 Episode 12).
Mark Larson is Vargas, the Bizarro Newman in The Bizarro Jerry (Season 8 Episode 3).
Mark Metcalf is Bob Cobb, a.k.a The Maestro in The Maestro (Season 7 - Episode 3) and in The Doll (Season 7 - Episode 16).
Marty Rackham is a police officer in The Trip: Part 2 (Season 4 Episode 2), and Jake Jarmel in other three episodes. The first The Sniffing Accountant (Season 5 Episode 4).
Marvin Braverman appears in The Handicap Spot (Season 4 Episode 22) and in The Opposite (Season 5 Episode 22).
Matt McCoy is Lloyd Braun in The Gum (Season 7 Episode 10) and in The Serenity Now (Season 9 Episode 3).
Michael Chiklis is a Steve Pocatello in The Stranded (Season 3 Episode 10).
Michael D. Roberts is Roger Ipswich, Peterman's accountant in The Chicken Roaster (Season 8 - Episode 8).
