I have more than one favorite episode to be honest, so I'll put all my favorites on here with the link to the video if your a fan of Code Lyoko.
Code Lyoko season 4: William Returns.
Code Lyoko season 4: Opening Act.
Code Lyoko season 4: Wreck Room.
Code Lyoko season 4: Crash Course.
Code Lyoko season 4: Hot Shower.
Code Lyoko season 4: Dog Day Afternoon.
Code Lyoko season 4: Distant Memory.
Code Lyoko season 4: Guided Missiles.
Code Lyoko season 4: Kadic Bombshell.
Code Lyoko season 4: Cannine Condrum.
Code Lyoko season 4: A Space Oddity.
Code Lyoko season 4: Music to Soothe The Savage Beast.
