Thread:Lego Master/@comment-2138661-20131220014556/@comment-2138661-20131227021719

Vilgax and Psyphon will explain this in Let Battle Commence, Part 2. They use technology and time travel to bring Ben's enemies together, as well as revive the deceased enemies. This is a flashback to Ben's 18th birthday, when he receives the Master Control, but it shows what Vilgax and Psyphon were doing during those events.