Shahid Khan

Shahid Khan was a former ISI agent and an infamous terrorist. He was the main antagonist in season 2. But in reality was helped by Guruji many times because he   was fulfilling gurujis wish unknowingly. He was the one who helped Isa in Mumbai bomb blast and take him out of the country on ISI's order. After that he defected from ISI and created his own terrorist group Hizbuddin. But he still remained in touched with Isa and worked with him many times. He also attacked Indian embassy in Tanzania.

Later life
He with a rogue ISI faction group smuggled fake currency in India to help his works. He came back to India to attack with neuclear bomb. But his plan was failed and he was killed by Sartaj. It is revealed that he and Sartaj were cousin's. His mother and Sartaj's mother were sibilings.