Paxton Whitehead

(1 episode) as Graham Hainsworth

as Uncle Millard

as Basil Rathwood

as King Salazar (voice)

(2 episodes) as Bernard Thatch

as British Reporter

(6 episodes) as Horace Walpole

as Dr. McMerlin

(1 episode)

(1 episode)

(1 episode) as Dr. Menard

(1 episode) as Commander (voice)

as McReady

(21 episodes) as Duke Stone

(1 episode) as Helford

(1 episode) as Cats' Producer

as Deane

(2 episodes) as Mr. Waltham

(3 episodes) as Dr. Whitcomb

as Dr. Tiberius Scott

as Harvey Wilks

as Judge In Heaven

(1 episode) as Dr. Campbell

as Cheshire

as Anton / Kreeger Paulovitch

as Dr. Henry Davenport, the Invisible Man (voice)

(8 episodes) as Hal Conway

as Father Rosetti

as Count (voice)

(1 episode) as Reginald Harrington

(2 episodes) as Hector Paradiso

(2 episodes) as Sir David Tushingham

(1 episode) as Judge (voice)

as Smythe

(1 episode) as Fenwick

as "Center" Instructor

(24 episodes)

as Phillip Barbay

as Lord Malcolm Billings

(1 episode)

(1 episode) as Captain Oliver

(1 episode) as Morgan

(1 episode) as William Troubshaw

(1 episode) as Patrick Burke

(1 episode) as Gordon Chumley