New never-before-seen images of Heath Ledger as The Joker and Christian Bale as Batman have surfaced online.
The behind-the-scenes images (via Vanitatis) feature Justo Dieguez, the martial arts expert responsible for the fighting style seen in The Dark Knight Trilogy.
Justo Dieguez designed his own system of martial arts, known as Keysi, that is a more real world approach to fighting as it focuses on using the environment and multiple attackers.
In addition to training Heath Ledger and Christian Bale, Justo Dieguez trained Liam Neeson (Clash of the Titans), Tom Cruise (Mission Impossible), and Daniel Craig (James Bond).
Regarding training Christian Bale, Justo Dieguez said the Batman picked up the style rather quickly as the actor has an almost photographic-like memory which enabled Bale to memorize the sequences after only one viewing.
Below you can also check out video of the movies that feature the Keysi fighting style, and if you head to the website via the link above you can check out a cool intro video where the martial artists mirror their movie counterparts.