Bane
THIS Bane is like comic book Bane and the Bane from TDKR. He doesn't take any crap, he's a skilled and intelligent fighter who kills to get what he wants. Also, Bane knows who Batman is because in this Animated Series universe the events of Knightfall did happen.
As Batman and Robin arrived at the pier, they broke threw the thick glass window on the roof.
When they dropped down on the floor, they saw Clover and Alex tied-up. As Robin approached them, he was met with a powerful punch that knocked him out.
"Robin!" Batman yelled as he rushed to his partners side. As some of the lights in the dim warehouse came-on, Batman realized who hit Robin: It was Bane.
"Hello Mr. Wayne. I'm so glad you could come," his Hispanic voice called out. "Tonight, I will finally succeed in BREAKING YOU." he finished as he stomped out of the shadows.
"I'll make you pay for that, Bane!" Batman said as he grinned his teeth while looking straight into Bane's mask.
"Then rise and face me!" Bane yelled as he ran towards Batman.
When Bane was about two feet away from Batman, he did a somersault over Bane and the two engaged in battle.
After about 10 minutes Robin finally woke-up. When Bane was directly behind him, Robin gave him a powerful side-kick to the back, then Batman followed it up with a twisting hook-kick.
As Robin was about to deliver more blows to Bane, Batman yelled, "I can handle Bane, you untie those two!" as he dodged powerful punches and kicks.
As Robin un-tied the two spies, victory looked slim for Bane. But then, he pressed a button on his gauntlet, sending venom to his brain and body. As he grew slightly larger in size he said , "PREPARE TO DIE, BRUCE!" after that, he grabbed Batman and threw him against a wall.
As he walked over to his fallen body, Robin and the two spies tried to attack him. But their efforts proved futile and Bane decided to just ignore them. As he lifted Batman's fallen body into the air, Batman immediately cut the tube supplying his brain with Venom. As he dropped Batman down, he took out a taser and electrocuted him, instantly knocking Bane out.
As Batman looked at Bane's fallen body Alex and Clover asked Batman, "Um, so are you really Bruce Wayne?" while scratching they're heads.
Batman then replied, "It doesn't matter who I am. The only thing that matters is saving your friend. Do you know where Joker took you?" he asked while tying Bane up.
"We went to a carnival somewhere but I don't know where." replied Alex.
"Hmm, Joker must be at his old fun-house hideout," he said while pressing a few buttons on is communicator. "You two come with me, Robin I have your Red Bird on the way."
"Okay Batman I'll meet you there!" Robin said as he ran outside.
"Come-on we have to get on the roof." Batman said as he grappled on the roofs ledge. As they made they're way up on the roof, the Batplane landed.
"Get in and fasten your set-belts." he said as they took off.