Bruce Wayne (Prime Earth)

Bruce Wayne is a billionaire playboy socialite who is secretly the super- hero Batman. Who donned the legendary cape and cowl to avenge the death's of his parents.

First Encounter
Batman is contacted by a scientist who works at Powers Laboratories, and tells the Dark Knight about a break in there. She describes a battle between the Foot Clan and the Turtles which resulted in the theft of an experimental generator. Batman vows to find the stolen tech, then returning to the Batcave, he tries to uncover the perpetrators. He is able to deduce that both teams of assailants were skilled in the art of Ninjitsu, thanks to the scientist's description of the fight. His friend and butler, Alfred Pennyworth believes that the League of Assassins to be behind the burglaries, but Batman did not. The way the clan of ninjas moves does not match the League's modus-operandi, so he is quick to reject that theory. Also there have been more thefts in Gotham City by these ninjas, all of which seem to be components to building something.

Batman then decides to stake out a Wayne Enterprises R & D facility because it is the next likely strike for the ninjas. Using some kind of hologram machine, Batman is able to fool the Foot Clan with false images of scientists who work there. The Batman demands they give him the reason they have been stealing all this equipment. A fight broke out and the Batman was victorious against the ninja clan. He interrogated one of the ninjas, who told Batman they merely "trying to get home". Batman then demanded to know about their metahumans, which confused the ninja. He tried to explain about these "turtles", but before he could, the ninja was killed by the Shredder, who warned Batman to stay out of his way or Gotham would pay the price.

Later atop a roof top, Batman witnessed the Turtles and their master Splinter gathered around his car and suddenly he realized what the Foot ninja meant when he mentioned turtles.

Bat-Fight
Batman confronts the Turtles in a one on four battle against them, which and his brothers were not prepared four. The Batman was able to put up a tremendous fight against the four Turtles. He took out first by disarming him of his Sai, then used the Batmobile's long ranged tase cables. Then attempted to avenge his fallen brother, but Batman easily defeated him and used Mikey's own Nunchaku to defeat. Leonardo, with his two swords in hand attempted to defeat Batman himself and avenge his brothers, but Batman used Raphael's Sai to break one of Leo's swords. Batman then attempted to gather information about the break in from Leo, which he assumed the Turtles were a part of.

Leo tried to explain that they only meant to stop it, but before anything was learned Splinter leapt in between them. Splinter and Batman had a short fight too and their Sensei admired Batman's skill in martial arts. However he tossed a smoke bomb which allowed them to escape from Batman.

Back at Wayne Enterprises, Batman as Bruce Wayne with Lucius Fox examine Raphael's Sai. Lucius explains to Bruce that the Turtles are from another universe. He explained the theory was from one of their scientists who was earlier kidnapped. Doctor Naveen Khan had begun the possible construction of a trans-dimensional portal, a way to cross into other dimensions. Also that the small amounts of mutagen that created the Turtles on the Sai is beginning to become inert. Which Bruce deduced the Turtles and Master Splinter will revert back to their original forms before mutation. They then discuss that all the missing tech along with Doctor Khan's kidnapping, someone wishes to build such a portal. The only missing component was a "resonance engine". So Bruce explained to Alfred about the Turtles and his need to find the engine before the Foot Clan can. Then he dons his costume to his the streets then seek out the Turtles and Splinter. Who in fact was watching what Batman had said about he and his sons. So then Splinter with his sons leads them to Batman's place of business, the Batcave.

Trivia
Batman is to meet the IDW's Ninja Turtles in a crossover event in November 2015.