Yuya defeating Satawari with a deck of common cards, despite Sawatari stealing and mastering the Pendulum cards for himself.
Yuzu escaping from the grip of Sawatari's friends.
Yuzu unlocking Pendulum Summoning during her duel against Sawatari.
The 3-on-3 School Duel between You Show and LDS. Even with Yuzu failing to defeat Masumi, You Show manages to come out on top.
Yuya's first duel against Reiji. Yuya and Reiji demonstrate their mastery of the summoning methods to a T.
Yuya obtaining his deceased brothers' ace dragons! The fact they are with him in spirit certainly comes as a surprise.
Rua defeating not one, not two, but three Obelisk Force members in a single turn during the Battle Royal. Reiji and his LC workers' reactions say it all.
Yuya's duel against Marik. He brings him back to his senses with the combined powers of himself, Odd-Eyes and Osiris. Yes, an Egyptian God chose him, folks.
Part 2: Synchro
Asuka's duel against Takasu. The fact she uses a Synchro monster rather than a Ritual or Fusion monster to beat him is an incredible feat.