1. The Flash
   Green Arrow
2. Batman
   Superman

Although Joker has faced off against various DC superheros over the years, the Clown Prince of Crime is best known as Batman's greatest nemesis. The psychotic criminal mastermind is widely regarded by fans as one of the greatest comic book villains ever created.

1. Joaquin Phoenix
   Marc Maron
2. Robert De Niro
   Jack Nicholson

Joaquin Phoenix is the first actor to play the iconic villain since Heath Ledger famously won an Academy Award for Best Supporting Actor for his portrayal of the Crown Prince of Crime in 2008's The Dark Knight.

1. Talia al Ghul
   White Rabbit
2. Lady Shiva
   Harley Quinn

Unlike many of DC's characters, Harley Quinn didn't make her debut in a comic book. The now iconic villain and Joker's main squeeze first appeared in Batman: The Animated Series in September of 1992. The character became such a hit, she later appeared in The Batman Adventures #12 in 1993.

1. Lennie Weinrib
   Larry Storch
2. Jack Nicholson
   Cesar Romero

Cesar Romero played the iconic DC villain in the TV series from 1966 to 1968, as well as Batman: The Movie in 1966. Interestingly enough, Romero refused to shave his mustache for the role, so a great deal of white makeup had to be used to hide it.

1. Jackson Dekker
   Jerome Valeska
2. Jack Napier
   Arthur Fleck

Sam Hamm and Warren Skaaren created the Jack Napier identity for Batman (1989) to pay tribute to actors Jack Nicholson and Alan Napier. Napier portrayed Alfred on the 1960s Batman series starring Adam West.

1. Cameron Monaghan
   Jack Nicholson
2. Joaquin Phoenix
   Heath Ledger

Heath Ledger tragically passed away on January 22, 2008, a few months after he finished filming his role as the Joker in The Dark Knight. Ledger's performance was so outstanding he received various posthumous accolades, including an Academy Award for Best Supporting Actor.

1. Detective Comics #27
   Batman #1
2. World’s Finest Comics #12
   The Brave And The Bold #34

Batman made his first appearance in Detective Comics #27 (Spring 1939), but the Clown Prince of Crime didn't make his debut until the following spring. Interestingly enough, Batman #1 also happens to be the first appearance of Selina Kyle a.k.a. Catwoman.

1. 41-50 pounds
   61-70 pounds
2. 51-60 pounds
   31-40 pounds

During a recent interview with the Hollywood Reporter, Joaquin Phoenix revealed that losing 52 pounds put him in the right mindset to play the Joker because losing that much weight "affects your psychology," and "you start to go mad."

1. Mark Hamill
   Brent Spiner
2. Michael Emerson
   Bruce Greenwood

Bruce Greenwood has never voiced the Joker, although he did voice Batman in the Young Justice series. Brent Spiner, best known for his portrayal of Lieutenant Commander Data in Star Trek: The Next Generation, was the voice of Joker in Young Justice.

1. To help hide his accent.
   His prosthetic kept coming off whenever he spoke.
2. Christian Bale gave him the idea.
   He was very thirsty while filming.

Gerry Grennell explained during the documentary that Heath Ledger continuously licked his lips during The Dark Knight because his prosthetic kept coming off when he spoke. He decided to turn this into a tic of the character as he was filming and the rest is history.

1. Jerry Robinson
   Jerry Siegel
2. Dick Sprang
   Neal Adams

Jerry Robinson was inducted into the Comic Book Hall of Fame in 2004. The late comic book artist will always be remembered by fans for his work on DC Comics during the 1940s and for co-creating not only the Joker, but Robin as well.

1. Taxi Driver
   Raging Bull
2. The King of Comedy
   The Color of Money

Other than the Martin Scorsese films, filmmakers have also revealed Alan Moore's 1988 one-shot graphic novel, "The Killing Joke," was also an inspiration for the film. Moore's story provides a take on an origin story of Joker, much like Todd Phillip's film will.