Kevin Conroy
Narrator (voice)

Neal Adams
Self

Will Arnett
Self

David Ayer
Self

Christian Bale
Self

Brian Bolland
Self

Alan Burnett
Self

Tim Burton
Self

Bradley Cooper
Self

Paul Dini
Self

William Dozier
Self (archive footage)

Zach Galifianakis
Self

Maggie Gyllenhaal
Self

Mark Hamill
Self

Geoff Johns
Self

Jenette Kahn
Self

Emma Tillinger Koskoff
Self

Heath Ledger
Self (archive footage)

Jim Lee
Self

Stan Lee
Self (archive footage)

Jared Leto
Self

Chris McKay
Self

Frank Miller
Self

Grant Morrison
Self

Jack Nicholson
Self

Christopher Nolan
Self

Jay Oliva
Self

Dennis O'Neil
Self

Todd Phillips
Self

Joaquin Phoenix
Self

Margot Robbie
Self

Jerry Robinson
Self (archive footage)

Andrea Romano
Self

John Stephens
Self

Emma Thomas
Self

Bruce Timm
Self

James Tucker
Self

Adam West
Self

Michael Uslan
Self

Cameron Monaghan
Jeremiah Valeska/The Joker (archive footage)