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The DNA bomb was an explosive designed by the hologram woman to latch on to John Hart's DNA. Knowing he would find some way around it, she split it into three cannisters and one eye, which she entrusted in a Blowfish, and told John it was an Arcadian diamond. She created a Rift storm, which took the Blowfish and cannisters to Cardiff. John killed her and used his vortex manipulator to ride the Riftstorm to Cardiff. The Blowfish was shot and killed by Jack Harkness and John collected the cannisters and the eye. The DNA bomb was activated, but John Deadlock sealed Gwen Cooper to him, forcing Torchwood Three to find a way to stop the bomb. Owen Harper injected John with blood samples of Torchwood workers and the bomb fell off. They threw it through the Rift storm John first came from. It blew up in the complexities of the Time Vortex, reversing time to the night John first came through. (TV: Kiss Kiss, Bang Bang)