Colonel James "Jim" Harper is a corrupt colonel of the U.S. Marine Corps, and a member of Project Cadmus.
Jim was brought in to deal with J'onn J'onzz's infiltration of the D.E.O. Jim, along with Lucy Lane, was there to clean up the agency. The two took J'onn, still in the form of Hank Henshaw, to an interrogation room so alien-proof that Supergirl could not listen in. During the interrogation J'onn told the two about what happened ten years earlier in Peru, when he befriended Jeremiah Danvers, which began with the real Hank Henshaw leading a manhunt for a alien who he believed was dangerous. Jeremiah tried to protect J'onn which ultimately lead to the "death" of the real Hank Henshaw. However, Jim, who was close friends with Hank, as well as having a hatred for aliens for no apparent reason, didn't believe him and he was placed in custody. J'onn told Alex Danvers she was next, and likewise was grilled by Lucy and Jim. She explained how J'onn as "Hank" approached her to join the D.E.O. after she was arrested after a DUI, saying that she was special, and that she owed it to her father to be the person he knew she could be. Alex even passed her lie detector test, but Lucy didn't believe her. After Kara discovered earphones so she could listen in, she was stunned that Lucy and Jim were taking the two to Project Cadmus.
After a moment of clarity, Lucy agreed to help Kara. Later that night, as the vehicle was en route, they were surrounded by motorcycles that throw the truck off course. One of the cyclists, Supergirl, disarmed the guards, while the other cyclist, Lucy, help Alex and J'onn escape, but not before J'onn erased Harper's memory of having remembered meeting him, but not before discovering that Harper had memories of Jeremiah Danvers, alive at Cadmus.
Jim is extremely arrogant, short-sighted, rude, disrespectful and hypocritical. He has a strong hatred for aliens, for no apparent reason; simply because they are different, regardless whether or not they are a threat to the human race. He even dislikes anyone who associates themselves with aliens for no apparent reason.
Jim is also quite immoral, as he helps the government experiment on aliens; violating their civil rights, he even violates human civil rights as well.
Behind the scenes
- In the DC comics, James "Jim" Harper is Guardian, a Golden Age hero notoriously known for being cloned several times by Project Cadmus. Harper was previously a police officer in Metropolis' Suicide Slum.