- "What you have just witnessed is the fourth medical miracle, Biomax!"
- —Jack Spheer on Biomax[src]
Jack worked with Lena Luthor in a garage, somewhere in Metropolis, on a project involving nanobots that could cure cancer. It was called Biomax and was a small startup before they separated. The pair encountered several problems and complications trying to perfect the nanobots' intended benevolent functions, with Jack presumably being the one more dedicated in ultimately absolving them all to perfection (such that Lena at least once perceived him as "insufferable" and threw a tantrum, along with a microscope at Jack, because of it). Lena subsequently moved to National City, but not before Jack giving her an ultimatum: stay and help him with their work on nanotechnology or leave to head Luthor Corp in atonement for Lex's crimes. Sadly, Lena chose the latter, leaving Spheer in a deep malaise.
Not long following, he performed a test trial on himself, injecting himself with the nanobots, accidentally merging with them. Though he didn't want to use them, due to their ability to take over the occupant's mind, Spheer began to be controlled by his business partner, Beth Breen.
National CitySoon after, Jack went to National City to showcase the completed version of Biomax, newly-created nanobots that could cure ails and injuries, thereby promising immense medical applications. He sent a personal invite to Lena in the hopes that she would appear at the presentation. At the presentation, he spotted her by the crowd, being taken aback. The launching proceeded well, with Jack making an impressive appearance and followed by listing the three known medical miracles of the world up to date (vaccines, anaesthesia and antibiotics) before revealing the "fourth" that would usher the new age of medicine, and personally demonstrating the capabilities of Biomax by cutting the palm of his hand and then allowing a small swarm of Biomax nanobots, released from a handheld sphere carried by Beth, to cauterize and mend the open wound, leaving no trace of it. He then proudly announced that Spheerical Industries would begin their launch of the new medical technology throughout National City. He then called for questions from the crowd and Kara Danvers questioned him as to if he was following the FDA's safety measures with his new Biomax nanobots. After the presentation, he reunited with Lena and was surprised to find that the one that grilled him during the presentation was her friend, before Kara left them to let them catch up. Lena congratulated Jack on finally solving how to calibrate the functionality and coordination of the nanobots, inquiring as to how. Jack offered to tell her over dinner; Lena was hesitant. Before Jack could urge further, Breen came over to them and informed Spheer that a private meeting with their shareholders was in order, prompting him and Lena to part ways.
That night, as a nanobot swarm, Jack attacked Joe Watkins' car as he and Kara sat in it, the former whistleblowing on Jack. The car blew up, killing Joe. Jack went to another whistleblower's house, Derrick Simmons, killing him shortly after telling the truth to Snapper Carr.
Shortly following, Jack visits Lena to ask her to dinner. Lena agreed on the terms that it be non-romantic. Their dinner was interrupted by Kara and Mon-El, who joined the dinner to question Jack about the human trials, which Jack answered to be on public record. Lena then asked how Jack completed Biomax and as he explained it, he claimed that the breakthrough only came after the revelation of how he regretted letting Lena leave. Kara attempted to disrupt the conversation but Lena asks for time alone with Jack. Mon-El humorously embraces Jack, simultaneously swiping his security badge, and left with Kara.
Jack and Lena retreated to L-Corp where Jack apologized for having made Lena choose between him and L-Corp, but Lena considered how different her life would have been had she stayed – even wondering whether she would have made a legacy outside of her family. The two shared a kiss. At the same time, Kara and Mon-El discovered a video of his self-trial, causing Jack to traverse to his office, closely missing them.
Having been told the information about Biomax by Kara, Lena confronted Jack, expressing her disappointment of having been lied to about the truth behind the Biomax breakthrough, recalling that the early prototypes for the nanobots that the two of them have worked on effectively robbed their first test subjects, lab rats, of free will. She revealed that she knows about the faked human trials and the brutal murders committed in tying up loose ends, but Jack confessed that he had no idea what she was talking about. Suddenly, he uncharacteristically froze. Beth Breen, Spheerical's CFO, appeared, revealing her to be in control of him. Supergirl appeared, but Beth unleashed some nanobots on her, pinning her against some equipment, suffocating her. Lena was able to destroy Beth's earpiece controlling Jack, beating down Beth. Lena attempted to override the mainframe, but Breen divulged that it would destroy the nanobots and kill Jack, as they were already merged into him. To save Supergirl and stop Beth, Jack pled out for her to override the system. Lena successfully overrode the mainframe, killing a suffering Jack.
Behind the scenes
- In the DC comics, Jack Spheer, known as Biomax, was the CEO of Biospheer Technologies, who developed the Biomax process, a plasma that could control organic tissue. He intended to use it to change and revolutionize the way food was produced, but after a number of people became sick due to Biospheer additives. Confronted by Green Arrow and Black Canary, he was accidentally pushed in to a vat of the Biomax formula, mutating into a sentient version of the formula, being able to control minds.