SPOILER WARNING: This article contains major spoilers for "Dead Man Running," the latest episode of The Flash Season 6.
Meet the new Wells, who is not quite the same as the old Wells. In "Dead Man Running," the latest episode of The Flash Season 6, Iris West-Allen and Cisco Ramon ran afoul of Dr. Harrison "Nash" Wells. In short order, he told them about the multiversal element he is searching for: Eternium.
Iris and Cisco initially confronted Nash in an alley. He swung down towards them with a grappling hook. When Cisco introduced himself, Nash slammed the scientist against a wall and pinned him there by the throat. "Why are you following me? To get your hands on this priceless beauty?" he demanded, showing them a red crystal. "Is that why? Go ahead, because it gives nightmare hallucinations to all of its victims. Would you like that?"
Nash's spiel was interrupted when the senor on his arm began to beep. He released Cisco and approached Iris, who looked taken aback. "So, it's you," he said. Before he could continue, Iris tasered him and knocked him out.
While Nash was unconscious, Iris and Cisco dragged him back to the Central City Citizen office, where they learned his name: "According to his techo fanny pack, this belongs to Dr. Harrison 'Nash' Wells."
When Nash woke up, they tried to make nice by mentioning the previous Wells they had worked with over the years. "We are friends of the Council of Wells," Iris said helpfully.
"Oh. Those idiots," Nash responded dismissively.
"What are you doing on our Earth?" Cisco demanded.
"I'm searching for an artifact that just happens to contain the same particles I'm currently reading off you," Nash replied, waving his sensor near Iris again.
"Particles of what?" Cisco asked.
"Eternium," Nash said. "Eternium is a multiversal element. Although the readings were stronger in the alley."
At that, Cisco put his foot down. "Listen, Indiana, I don't know they do things on your Earth, but this ain't Temple of Doom," he said. "And what is Eternium supposed to be, anyway? Some kind of stolen mystical element from the tiki gods that you suddenly have to return?"
"Look, there's no such thing as mystical mumbo jumbo or gods," Nash insisted. "What there are, are metahumans, aliens and false gods worshiped by simple-minded people that find comfort in myths. I dispel those myths. You people are no help." With that, he detonated a smoke bomb and beat a hasty retreat.
Eternium first appeared in 1998's Legion of Super-Heroes #110 by Tom McCraw, Tom Peyer and Scott Kolins. In the comics, Eternium comes from Rock of Eternity. The Rock of Eternity, of course, is home to the wizard Shazam and once served as a prison to the Seven Deadly Sins. Originally based in Fawcett City, the Rock of Eternity was destroyed, scattering its matter across the multiverse. That matter became known as Eternium. Because of its source, Eternium has the ability to block the power of Shazam. Additionally, it injures anyone who comes into physical contact with it.
At the time of writing, it is unclear what Eternium looks like in the Arrowverse. Nash didn't exactly provide a whole lot of information about the element, what it does or why exactly he is looking for it. However, considering the fact it has to do with the multiverse, it may have a role to play in "Crisis on Infinite Earths."
Airing Tuesdays at 8 p.m. on The CW, The Flash stars Grant Gustin, Candice Patton, Carlos Valdes, Danielle Panabaker, Tom Cavanagh, Jesse L. Martin, Danielle Nicolet and Hartley Sawyer.