But when she sets off the bomb , killing them both , the first alternate Superboy rescues the original Superboy from the kryptonite - laden shockwave .
Lana arms herself with kryptonite bomb to destroy the Sovereign , hurting both versions of Superboy .
When Lana sets off the bomb , killing them both , the first alternate Superboy rescues the original Superboy from the kryptonite - laden shockwave .
Lana arms herself with kryptonite bomb to destroy the Sovereign , hurting both versions of Superboy .