John O'Hurley

as Self - Host

as Self - Contestant(4 eps)

as Don 'Pop' Philips

as King Neptune (voice)

as Arnold Harris

as General Zartogg

as Hades Burns (voice)(4 eps)

as King Neptune (voice)(3 eps)

as God (voice)

as Roger Doofenshmirtz (voice)

as Walter

as Self(2 eps)

as Influenza(1 ep)

as Father David

as Glenn

as Hadithi (voice)(1 ep)

as Vex Mullery (voice)(1 ep)

as Gothball (voice)(10 eps)

as Mr. Slate (voice)

as Donny De Bona

as The Great Pauldini (voice)

as (voice)(1 ep)

as Christopher Neff(7 eps)

as Knight Lilliputtian (voice)(1 ep)

as Mr. Rexford

as Lola's Dad (voice)(1 ep)

as Narrator(1 ep)

as Skipper Shelton (voice)(8 eps)

as King Neptune (voice)

as Drug PSA (voice)

as Rear Admiral Ted Gordon(1 ep)

as Ellis Crane (voice)(3 eps)

as Sir Sinclair M. Skeeto

as Silvano

as Buddy Hennings(1 ep)

as Self

as Captain Jim Bob Sherwood(1 ep)

as Roger Doofenshmirtz (voice)(27 eps)

as Ro-juh Doofengung (voice)(1 ep)

as Kringle (voice)

as Self

as Self - Contestant(8 eps)

as Self - Restaurant Patron(1 ep)

as Dentyne Executive / Pilot (voice)(1 ep)

as Self(1 ep)

as Blake (voice)(4 eps)

as Buck Reynolds(1 ep)

as Mr. Simms

as Dr. Carlson(1 ep)

as Peter(1 ep)

as Roger Heidecker(11 eps)

as Star Johnson (voice)(1 ep)

as Captain Star Johnson (voice)(3 eps)

as Self - Host(24 eps)

as Beavis Bottomczek (voice)(1 ep)

as Mayor Snipper (voice)(1 ep)

as Neils (voice)

as Tim 'Timbo' Chadway

as King Wallace II / Ancient King (voice)(1 ep)

as Johannes Niels (voice)(2 eps)

as Earle Hansen

as Richard Mecks

as Phantom Blot (voice)(2 eps)

as Mr. Bill Erlicht(4 eps)

as King Nova (voice)(5 eps)

as Mayor Sam

as Self - Host(1 ep)

as Walter Drooz

as Paul Holdrith

as King Neptune (voice)(5 eps)

as Cult Leader (voice)(1 ep)

as (voice)(1 ep)

as King Cinyras (voice)(1 ep)

as Stewart

as Stewart Collins

as Woody Woodson(1 ep)

as Mr. Ferber(1 ep)

as Robert McSwain(12 eps)

as Wyn Goalmaster(1 ep)

as Hugh Sterling(1 ep)

as Hal Damon

as Ted Dunleavy

as Brad Shaw(2 eps)

as Professor Beltran(1 ep)

as Johnny on TV Show (voice)(1 ep)

as Hennessey

as Lt. Cabrell

as Kemp(1 ep)

as Kyle Roberts(1 ep)

as Tad Sherman(11 eps)

as Allen Cooper(1 ep)

as Announcer #2(1 ep)

as David Coopersmith(1 ep)

as Cal(1 ep)

as Grant(1 ep)

as Thomas Jay Fallow(1 ep)

as Dr. Pollidori(1 ep)

as Jean Luc Gerard(1 ep)

as Dr. VonDerphal(1 ep)

as John Marshall(1 ep)

as Howard Gurman(6 eps)

as Paul Manetti

as Detective Turner

as Pat DiCicco

as J. Peterman(22 eps)

as Dolan

as Dr. Salters(1 ep)

as Ralph Stafford(1 ep)

as Stephen Slade(255 eps)

as Greg Shaeffer(306 eps)