Ron Livingston

as Larry

as Donny

as Mark Severson

as Self

as Andrew

as Fred

as Bob Kaplan

as Self - 'Henry Allen'

as Henry Allen

as Narrator

as James

as Jim Lamson

as Peter Waxman (voice)(16 eps)

as Future JR Maguire (voice only)

as Self

as Self

as Self(1 ep)

as Blake(3 eps)

as Pete

as Mac Kamen (voice)(1 ep)

as Henry Wright

as Flag Pin

as Francois

as Alex Myers(1 ep)

as Jon Dixon(13 eps)

as Drew Moreau

as Sam Loudermilk(30 eps)

as Bobby Lawrence

as Kyle Walker

as Keith(12 eps)

as Elvis Presley

as Sydney Stein(1 ep)

as Oliver Sullivan

as John Carver(2 eps)

as Ben

as Edwin

as Bob

as David Lipsky's Editor

as Ethan

as Richard

as Self(1 ep)

as Charles

as Self(1 ep)

as James Hosty

as Adrian

as Chris

as Roger Perron

as Captain Wonder

as Paul

as Franklin Crudstaff

as Rance McCoy

as Mark Wallace

as Dr. Liberman

as Ron Livingston

as Roy Phillips(12 eps)

as Will Broderick

as Caldwell

as Charles Scheffel (voice)(10 eps)

as Gomez

as Maddux Donner(13 eps)

as Self - Guest(1 ep)

as Dr. Bannister

as Johnny

as Rudolf

as Richard Pimentel

as Matt Flannery(18 eps)

as Patrick

as Howard Fornoy(1 ep)

as Dr. Richard Clayton

as Narrator

as Ron

as Clerk (voice)

as Bob Memari (voice)(3 eps)

as Percy Anderson

as Self(1 ep)

as Self

as Dr. Sebastian Charles(1 ep)

as Derek

as Eric Gatley (uncredited)

as Mr. Bricker

as Self(1 ep)

as Larry Sokolov

as Self(1 ep)

as Donnie Anderson

as Self(1 ep)

as Self - Guest(1 ep)

as Marty Bowen

as Tyler Bellows

as Self

as Lewis Nixon(10 eps)

as Marty Sachs

as Uncle Charlie

as Allen Ginsberg

as Ron Statlin

as Trent

as Sheldon Buckle

as Self(1 ep)

as Peter

as Jack Berger(7 eps)

as Mitch(6 eps)

as Self(1 ep)

as Alan Lowe(8 eps)

as Rick (segment "The Honeymoon") / RV Driver (segment "The Campfire")

as Rob

as Curt(15 eps)

as Self(2 eps)

as Chad

as David Anderson(1 ep)

as Self - Guest(1 ep)

as Himself(1 ep)

as Soldier