The Statue (Season 2 Episode 5).
Michael D. Conway is Ray in
The Chicken Roaster (Season 8 - Episode 8).
Michael D. Roberts is Roger Ipswich, Peterman's accountant in
Michael Des Barres is restaurateur in The Smelly Car (Season 4 Episode 21).
The Barber (Season 5 - Episode 8).
Michael Fairman is Mr. Penske (the owner of Penske file) in
The Wig Master (Season 7 - Episode 18) and Player in The Understudy (Season 6 - Episode 23).
Michael James McDonald is Jesse in
The Betrayal (Season 9 Episode 8).
Michael McShane is Franklin Delano Romanowski in
Michael Milhoan is the security guard in The Stranded (Season 3 Episode 10).
The Chinese Restaurant (Season 2 Episode 11) and Photographer in The Puffy Shirt (Season 5 Episode 2).
Michael Mitz is Phone Guy in
Michael Richards is a Cosmo Kramer in 170 episodes. In fact, he appears in all but two episodes: The Chinese Restaurant (Season 2 Episode 16) and The Pen (Season 3 Episode 3).
Michelle Forbes is Julie, George's girlfriend in The Big Salad (Season 6 Episode 2).
Mike Hagerty is Rudy, a cabana wear vendor in The Raincoats (Season 5 Episodes 18-19).