Neil Patrick Harris

as Desi Collings

as Neil Patrick Harris (voice)

as The Analyst

as Steve (voice)

as Chester Creb

as Barney Stinson

as Colonel Carl Jenkins

as Barney Stinson (voice)

as Celebrity Dance-Off Host

as Foy

as Jeff Lonowski

as Patrick Winslow

as Screaming Reaver (uncredited)

as Steve (voice)

as Prince Gumball (voice)

as Will Fratalli

as Richard Fink

as Patrick Winslow

as Neil Patrick Harris

as Nightwing (voice)

as Neil Patrick Harris

as Neil Patrick Harris

as Neil Patrick Harris

as Count Olaf

as Bryan Ryan

as Mike Hammond

as Lou (voice)

as Lowell / The Tattoo Collector

as Self

as Ray Thompson (voice)

as Bill

as Executive / Harvey Dent / Two-Face / Three-Face / Four-Face (voice)

as Barry Allen / The Flash (voice)

as Dr. Horrible

as Self - Host

as Adult Jake Doyle / Narrator

as Dr. Blowhole (voice)

as Tommy Remsen

as Lance

as Ethan Burdick

as Self - Guest

as Peter Parker / Spider-Man (voice)

as John Tagman

as Barney Stinson

as Self - Guest Judge

as Music Meister (voice)

as Self

as Self - Celebrity Guest

as Self

as Todd Andrews

as Howie Morrison

as Henry Coltrane

as Replay / Johnny Morrow (voice)

as Self

as David

as Jonas

as Self

as Self - Guest

as Self - Guest

as Self

as Alan Schack

as Self

as Doogie Howser

as Self

as Michael Lawson

as Self - Guest

as Self

as Moyo (voice)

as Self

as Self - Guest

as Host

as The Dauphin

as Self

as Himself - Host

as Self

as David Hart

as Joe Baxter

as Self - Guest

as Two-Face / Black Manta (voice)

as Self

as Self

as Neville LaRoy

as Roger Martin

as Self

as Self

as Robert

as Self

as Self

as Jeff

as Self

as Dr. Philip O'Hanlon (voice)

as Self

as Nathan Andrews

as Self

as A Very Smart Fellow

as Himself

as Self - Narrator (voice)

Role: Director

as Tobias

as Peter Corman

as Will Martin

as Patrick

as Self

as Westley

as Himself - Guest Judge

as Jim Stolpa

as Billy Johnson

as Self

as Self

as Self - Reader: Declaration of Independence

as Himself

as Self

as Arnold Mosk

as Brian Hannigan

as Doogie Howser

as Self

as Self

as Neil Patrick Harris

as The Toymaker (archive footage)

as William Coit

as Henry McNeeley

as Self

as Self - Judge

as Self

as Edward Broder

as Self

as Buder

as Steve Thompson

as Moyo (voice)

as Self - Host

as Lonnie

Role: Creator

as Travis Cleveland

as Lonnie Tibbettes

as 1st Lt. David Hettema / Sgt. William Manchester

as Max (voice)

as Self

as J.C. Leyendecker (voice)

as Self - Guest

as Self - Host

as Will Tweedy

as Self

as Jed (voice)

as Steve the Monkey (voice)

as Steve (voice)

as The Toymaker (archive footage)

as Self

as Danny Harland

as Self - Moderator

as Self

as Self

as Self

as Neil Patrick Harris

as Jimmy Burden

as Dr. Blowhole (voice)

as The Comic Shop Owner (voice)

as Benjamin

as Self

as Himself

as Host

as Self

as Self - Guest

as Self - Actor

as Paul Keller

as (voice)

as Self

as Narrator (voice)

as Self

as Dan

as Self

as The Boss

as The Balladeer / Lee Harvey Oswald

Role: Executive Producer

as The Shoe Fairy (uncredited) (archive footage)

as Narrator

as Host / Himself

as The Magic Mirror

as Narrator

as Narrator

as Self

as General Wilhelm Reuss

as Host

as Self

as Self - Host

as Self - Guest

Role: Executive Producer

Role: Executive Producer