Garth was killed during the "Legion Lost" storyline, sacrificing himself in battle with the Progenitor (actually an insane Element Lad). A few crystals were left from the destruction of the Progenitor, which Kid Quantum took with her upon the Lost Legion's return to the "first" galaxy; she left the crystals on Shanghalla (the heroes' graveyard). It turned out Garth's essence survived in the crystals and Jan's body regrew but with Garth's mind. He was apparently able to use both the Element Lad and Lightning Lad powers in the new crystalline body. His relationship with other Legionnaires, including Saturn Girl, was strained due to his outward resemblance to the Progenitor.