Leonid Pavel

Dr. Leonid Pavel was a Russian nuclear physicist who was captured by the terrorist Bane to create a nuclear bomb.

Captured
Dr. Pavel met up with a CIA operative to be escorted via airplane back to his home. When he met up with the CIA operative, he revealed three prisoners with him who had tried to capture Pavel. The three were brought on the plane with Pavel and were exectued one by one until the last one, Bane, talked. Bane revealed that his plan involved getting captured and crashing the plane with no survivors on it. Bane's men attacked the plane and Dr. Pavel was grabbed by Bane and pulled from the plane before it crashed. Afterwards, Pavel was presumed dead in the crash.

Making the bomb
A few months later, Pavel resurfaced when Bane took the board of Wayne Enterprise hostage. Pavel watched as Bane forced Lucius Fox, Miranda Tate, and George Fredericks to accompany him and Pavel down to the sight of the nuclear fusion reactor which could supply Gotham with a great amount of energy but could also be turned into a nuclear bomb. While Fredericks was held at gunpoint, Fox unlocked the reactor via his fingerprints and Pavel was forced to create the bomb.

Once he was finished, Bane had the reactor removed from the sight, despite protest from Dr. Pavel that it would become unstable over time and explode. Bane didn't listen to Pavel and he caused a series of explosions around Gotham which trapped the police forces underground, destoryed Gotham's football stadium, and killed Mayor Anthony Garcia and other politicians and officials.

While the crowd at the stadium was still reacting to the destruction, Bane, Pavel came out onto the football field with the reactor and Pavel was forced to explain the devise. After he told everyone that it was a nuclear bomb and only he could defuse it, Bane snapped Pavel's neck to ensure the bomb wouldn't be deactivated.