|Appeared in||Batman Beyond: Rebirth|
Warren McGinnis was the father of Terry McGinnis, the second Batman. After McGinnis discovered his employer was planning on creating nerve gas for war, he was killed, which prompted his son Terry to become the Batman.
At some point, Warren came to work at Wayne-Powers' research division. One day, he was contacted by Harry Tully, who asked that Warren meet with him. Warren noticed that Tully was looking "slagged" and observed a series of strange bruises on Tully's arm. Tully handed Warren a disc, but before he could explain further, their meeting was cut short by Mr. Fixx, who had Tully taken away. Warren's questions about Tully's condition went unanswered.
Shortly thereafter, Derek Powers summoned Warren to his office, who explained that Tully had suffered an allergic reaction to a chemical compound in the laboratory. Powers assured Warren that Tully would soon make a full recovery. Warren accepted the explanation, though he was not entirely convinced, and on his way out, Powers asked him if he knew about a file that was missing from Tully's records. Warren denied any knowledge of it.
Once at home, Warren investigated the disc Tully had given him. In the midst of this, Warren found himself embroiled in an argument with Terry. Their tempers flared at one another, and the argument ended with Terry scoffing at his father's life accomplishments and storming out of the apartment, flouting the fact that his father had grounded him on account of Terry getting into a fight at school. Shortly after Terry's departure, Warren was visited by Mr. Fixx.
Some hours later, Terry returned home to find his mother waiting for him and that Warren had been murdered. The police blamed the crime on the Jokerz, since the hallway had been spray-painted with the word "HA!" The details of Warren's death remained undisclosed, though Mr. Fixx later confided to Derek Powers that he "took care of his [Terry's] old man". Sometime between Terry's departure and his death, Warren was able to hide the disc given to him by Tully in a picture frame, which was later found by Terry.
Warren's murder had a profound influence on Terry's life, prompting him to take on the role of the second Batman.