Sharing the identity of Firestorm, with Ronnie being the brawn and Jason being the brains, Firestorm is considered for recruitment into the Justice League along with several other heroes. They play a large part in the events leading up to the Trinity War, the three-way battle among the Justice League (the original team headed by Superman, Batman and Wonder Woman), the Justice League of America (the A.R.G.U.S.-sponsored team led by Steve Trevor, Green Arrow and Amanda Waller), and Justice League Dark (the paranormal team consisting of John Constantine, Zatanna and the Phantom Stranger). When Superman is framed for the death of Dr. Light and the League is taken into custody, Amanda Waller has Firestorm experiment on their ability to create certain elements: specifically, the mass production of kryptonite. It turns out that the two are indeed capable of using their powers to create it, but with some difficulty. However, this ultimately becomes moot once the Trinity War leads to the invasion of the Crime Syndicate, who supposedly kill the Justice League. In fact, the League is trapped inside Firestorm by his Earth-3 counterpart Deathstorm (a combination of Martin Stein and a corpse he experimented upon), with only Batman and Catwoman escaping the initial fracas. The Leagues are presumed dead for a time, but are eventually freed from captivity after the Syndicate is defeated by Batman and Lex Luthor's Injustice League, Batman using Wonder Woman's Lasso of Truth to draw her and the others out of Firestorm.