About the Enies Lobby Arc
The Straw Hats, Sogeking, the Franky Family, and the shipwrights of the Galley-La Company arrive at Enies Lobby aboard the Rocketman to rescue Nico Robin and Franky. Standing in their way, however, are the forces of the World Government, including its deadly assassination unit, CP9. A massive battle ensues between the two sides when Luffy declares war against the World Government.
Reunited with Sanji and Sogeking (Usopp) shortly thereafter on the Rocketman, the Straw Hats, along with the Franky Family and Galley-La, began an all-out assault on the government island of Enies Lobby against thousands of Marine soldiers and the Cipher Pol agents in a last-ditch effort to rescue their friends Nico Robin and Franky before they are dragged through the Gates of Justice. The massive doors are the only thing standing between Robin and Franky and their respective destinations: Marine Headquarters and the terrifying prison of Impel Down.
While the others battled with the giants Oimo and Kashii, dog-riding guards, monstrous jurors and a three-headed judge, Luffy rushes ahead and engages the numerous Marines and Agents on the island; in spite of their numbers and numerous wrong turns, he overpowers them and eventually reaches the roof of the courthouse. Meanwhile, Spandam gloats with overconfidence until a Marine finally reports in that casualties are mounting at a horrendous rate: over 2,000 so far, with Luffy himself responsible for half that total. Furthermore, thanks to his previous contact with Dorry and Brogy, Sogeking was able to convince Oimo and Kashii to defect. For the first time, Spandam starts to panic. On the courthouse roof, Luffy encounters CP9 agent Blueno. Unlike last time, Luffy is able to keep track and match his skill. Then Luffy reveals his new Gear 2 ability, which allows him to imitate the technique Soru to great effect, enhances his body to withstand the strain while using it, and allows him to overpower Blueno's strongest Tekkai technique, ultimately knocking him out. Franky used his Coup de Boo to free himself from his chains taking Robin with him. Luffy called out to Robin and told her that he was coming for her. She replied that she didn't want to be saved and that she just wanted to die.
The others finally catch up, and as the CP9 and Straw Hats face each other, Robin's past is finally revealed, as well as her last reason for being unwilling to return to the crew: having been betrayed so many times in the past, she's terrified that one day the Straw Hats will see her as a burden, and also betray her. She screams that she would prefer death to that. The other Straw Hats quietly acknowledged the reason Robin had, then Spandam burst out laughing, saying she's absolutely accurate, and nobody would be stupid enough to think she wasn't a burden after traveling with her. Spandam pointed at the flag on top of the Tower of Justice and told Luffy that the organization after Robin is over 170 affiliated nations.