 Akane explains that Sigma , after his abduction in 2028 , had his consciousness transported into his elder self 's body in 2074 , while his elder self 's consciousness was transported into the younger Sigma 's body in 2028 . This was the goal of the AB project , to make it possible for the elder Sigma to prevent the Radical @-@ 6 outbreak in 2028 with his future knowledge ; Dio sought to prevent this goal . Akane makes Phi and Sigma 's consciousnesses jump to 2029 , after the outbreak . Sigma , as Zero Sr. , spends the next 45 years developing the AB project together with Akane , while Phi is kept in cold sleep . Sigma also creates a clone of himself as a spare , in case his own body gets damaged . When they again arrive at 2074 , Sigma and Phi jump back to 2028 to infiltrate the Mars mission test site . 
