Daniel Gerroll

as Arthur Sledge (3 episodes)

as Warren Foster (1 episode)

as Dr Pinfield-Smith

as Emmett Schaab (1 episode)

as Dr. Lyon

as Peter Hudson (1 episode)

as Dick Blackworth

as Eric Wellman

as OsCorp Department Head

as Stanley Birch (1 episode)

as Ray Curston (1 episode)

as Ryan

as Dr. Theo Lawton (1 episode)

as David Shea (8 episodes)

as Bronson Alcott

as Colonel Pash

as Carson Huxley (1 episode)

as Thomas Jefferson

as Lindsay Dunne (2 episodes)

as Phillip (1 episode), as Bernard Cove (1 episode)

as Mr. Marvelous (2 episodes)

as General Charles Cornwallis (6 episodes)

as Maxwell Perkins

as David Marston