Code Lyoko
Season 4 Episode 11 - The Lake
Jeremy, Aelita, Ulrich, and Odd go with the rest of their science class on a field trip to an island in the middle of a nearby lake to study water-based plant life. Yumi, not part of the class, remains behind to sit through two important exams. Jeremy's fears about X.A.N.A. attacking at such an inopportune moment are realized when X.A.N.A. creates an electricity-blasting sludge that attacks anyone who approaches the shore. Yumi is forced to go to Lyoko alone. She fights William and during their fight is able to reach his true mind and personality. Though X.A.N.A. soon manages to regain control of William, Yumi is saved by Aelita, who escaped the island on Sissi's bike. Aelita is able to deactivate the tower and Yumi claims that one day they will bring William home. She initiates a return trip to the past and the class is saved from electrocution.
Episodes in Season 4
William Returns
23 min
Double Take
23 min
Opening Act
23 min
Wreck Room
23 min
Skidbladnir
23 min
Maiden Voyage
23 min
Crash Course
23 min
Replika
23 min
I'd Rather Not Talk About It
23 min
Hot Shower
23 min
The Lake
23 min
Lost at Sea
23 min
Lab Rat
23 min
Bragging Rights
23 min
Dog Day Afternoon
23 min
A Lack of Goodwill
23 min
Distant Memory
23 min
Hard Luck
23 min
Guided Missile
23 min
Kadic Bombshell
23 min
Canine Conundrum
23 min
A Space Oddity
23 min
Cousins Once Removed
23 min
Music to Soothe The Savage Beast
23 min
Wrong Exposure
23 min
Bad Connection
23 min
Cold Sweat
23 min
Down to Earth
23 min
Fight to the Finish
23 min
Echoes
23 min
