The entire first half of episode one, when the idols put on their performance while being attacked by military tanks and riot forces. Especially if the viewer was expecting a normal slice-of-life show, and then got an amazing futuristic action sequence instead.
The WOTA brigade who enter in episode 6, deploying a handheld glowstick missile barrage and mecha decorated with AKB0048 members to assist Team 00 in fighting off DES.
Episode 9: Coordinated Multiple Concerts as a decoy for the main event
Episode 13 in its entirety. No, seriously. The awesome is so widespread in the episode there is no way to pick and choose among it.
