Escaping Shinra, the party discovers Cloud at an island hospital in a catatonic state from Mako poisoning; Tifa stays as his caretaker. When the island is attacked by a planetary defense force called Weapon, the two fall into the Lifestream, where Tifa helps Cloud reconstruct his memories: a shy child during his time in Nibelheim, Cloud was blamed when a young Tifa injured herself trying to cross Mt. Nibel. Resolving to become stronger, Cloud leaves for Midgar to join SOLDIER but was never accepted into the organization; the SOLDIER in his memories was his friend Zack. At Nibelheim, Cloud surprised and wounded Sephiroth after the latter's mental breakdown, but Jenova preserved Sephiroth's life. Hojo experimented on Cloud and Zack for four years, injecting them with Jenova's cells and Mako; they escaped, but Zack was eventually killed. The combined trauma of these events triggered an identity crisis in Cloud; he constructed a false persona around Zack's stories and his own fantasies. Cloud accepts his past and reunites with the party, who learn that Aerith's prayer to the Planet had been successful: the Planet had attempted to summon Holy to prevent Meteor's impact, but Sephiroth blocked Holy.