Infinite Crisis

In the 2006 miniseries Infinite Crisis it was revealed that Martin Stein, alive in space as the "Elemental Firestorm", had sensed the presence of Jason within the Firestorm Matrix, but was unaware of the final demise of Ronnie Raymond. When Jason, as Firestorm, was gravely wounded in the line of duty, Stein linked with him in a variation of the merge, promising Jason a new Firestorm body to let him return into battle (although Martin had been unable to save Mick) and asking him about the fate of Ronnie.

Accepting Martin's proposal, Jason asked Stein to become the permanent second member of the Firestorm matrix. Sensing his "errors", including Mick's death, were the result of his youth and lack of experience, he sought the experience and maturity of Stein. Martin refused at first, but finally accepted Jason's request, thus ensuring both a new Firestorm body and the reconstruction of human bodies for both Rusch and Martin.

It was revealed in Infinite Crisis that if the Multiverse had survived up to the present, Jason would have been a native of Earth-Eight.