Agent John Bishop is an U.S. Special Agent, leader of the black-ops Earth Protection Force within the U.S. Government. He has a hateful vendetta against aliens, seeking to avoid any invasions should they ever arise. His main focus is to protect the Human Race, and will do anything and everything to make sure they are protected from any threat, alien or mutant.

Rise of the TMNT verse, set post movie. 

As president of the Pan Galactic Alliance, John Bishop was the first to chase after Sh'Okanabo when the warlord went back in time to the 21st century. Now, stuck in the past with little to no help, Bishop turns to the Turtles for help.

With knowledge of the future and a small arsenal of future tech at his disposal, Bishop is a powerful ally for the Turtles, though he keeps most of the information he has close to his chest to not change the future.

Bishop, after being rescued by an alien that he'd been experimenting on when his base was destroyed, realized that if one of his prisoners had the compassion and mercy to save their captor, he could also. Bishop decided then that the best way to avoid an invasion of Earth was to broker peace between Earth and other planets instead of inciting violence.

Bishop creates the Pan Galactic Alliance, a peaceful initiative to bring the inhabitants of Earth and other planets together in harmony. As he was the one to initiate it, he is the current President and Earth is the center of operations.

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