J. McGill (died 2016) was a double agent sent by Project Cadmus into the D.E.O. to annihilate aliens.


After Supergirl brought Superman to the D.E.O., McGill shook his hand and admitted that it was an honour to meet him.[1]

After Alex and Winn deduced that McGill was the one who had been stealing Kryptonite from the D.E.O. supply, Alex told him that they were preparing a new shipment of the mineral and she wanted him to lead it. She followed and cornered him when he tried to smuggle the Kryptonite away from the transport. However, before Alex could interrogate him, he was shot by Lillian Luthor.[2]



Season 2


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