William taking down a swarm of Kankerlats in episode 11.
On the villain side, episode 14 is one for Tyron and the Ninjas. They throw a fight in the core so one can sneak back to Lyoko and install a transmitter there, and Jérémie's attempt to download more data only netted him a virus.
"Chaos à Kadic": Aelita was pretty chilly towards Laura for revealing to her father about the Supercomputer, which I thought was pretty cool because she was definitely mad. Kudos to her actress.
"Confusion": Ulrich and a Ninja are the last left standing after a big Mêlée à Trois. Ulrich tricks him with a short burst of Super Speed, reminding everybody who's the best pure fighter of the Lyoko Warriors.