WB have passed me the following 30+ images from episode 12 & 13 with a video clip featuring The Red Hood from Episode 12 titled "Deep Cover for Batman!" which was previewed at NYCC '09.

Episode 13 "Game Over for Owlman!", gives viewers what they've all wanted to see.... The first appearance of "The Joker".

Synopsis:
When parallel worlds collide, Batman swaps places with Owlman--his criminal counterpart in an alternate universe--to stop the Crime Syndicate from taking over their world. Crime fighters in one world must battle their evil counterparts in a crime spree melee.

Meanwhile back on Earth, Owlman has been perpetrating crimes disguised as Batman and assembled all the villains to join him. When Batman returns, he finds himself on the wrong side of the law and hunted by Green Lantern, Aquaman, Blue Beetle, Red Tornado and Plastic Man. It’s a strange twist of fate that leaves Batman with only one option - to team up with Joker and take Owlman and the Crime Syndicate down!

Voice actors starring in this episode include:
Deidrich Bader - Batman / Owlman
Jeff Bennett - Red Hood / The Joker
James Sie - Dyna-Mite
Corey Burton - Red Tornado / Silver Cyclone
Will Friedle - Blue Beetle / Scarlet Scarab
James Arnold Taylor - Green Arrow / Blue Bowman