CharacterRoger Elliot (flashback, Harley Quinn (Harleen Quinzel) (cameo, Villain, Hush (Thomas Elliot) (origin, villain), also as Lefty Knox), Hush (Thomas Elliot) (villain), Hush (Thomas Elliot) (origin, Batman (Bruce Wayne), Justice Society of America (JSA, Cameo, Poison Ivy (Pamela Isley) (cameo, Officer Levin, Joker (flashback, hush (Thomas Elliot), Peyton Riley (flashback, Batman (Bruce Wayne, Zatanna, Riddler (Edward Nigma) (flashback, Tweedledum (Dumson Tweed), Oracle (Barbara Gordon), Harley Quinn (Harleen Quinzel) (flashback, villain), Mr. Freeze (Victor Fries) (flashback, The Wonderland Gang (Tweedledee (Deever Tweed), James Gordon, Scarecrow (Jonathan Crane) (Villain), Marla Elliot (flashback, Dr. Mid-Nite (Pieter Cross)), Mr. Terrific (Michael Holt), Alfred Pennyworth, Catwoman, death), Penguin (Oswald Cobblepot) (cameo, Peyton Riley (flashback), Robin (Tim Drake), Oracle (Barbara Gordon) (cameo), Milt, Nurse Margaret, Colin, Poison Ivy (Pamela Isley) (flashback, Thomas Wayne (Flashback), The Carpenter (Jenna Duffy)) (villains), Dr. Aesop (first appearance, death?), Justice Society of America (Mr. Terrific (Michael Holt), Selina Kyle (Catwoman), Marla Elliot (flashback), The Walrus (Moe Blum), Mr. Prescott (flashback, Nightwing (Dick Grayson), Joker (Villain), Slam Bradley (cameo)
Series TitleBatman: Heart of hush