Jeremy and Aelita must rebuild a new Lyoko to replace the one XANA maliciously destroyed at the end of the third season.
4 - 1William Returns Aug. 13, 2007
4 - 2Double Take Aug. 14, 2007
4 - 3Opening Act Aug. 30, 2007
4 - 4Wreck Room Aug. 15, 2007
4 - 5Skidbladnir Aug. 16, 2007
4 - 6Maiden Voyage Aug. 17, 2007
4 - 7Crash Course Aug. 20, 2007
4 - 8Replika Aug. 21, 2007
4 - 9I'd Rather Not Talk About It Aug. 22, 2007
4 - 10Hot Shower Aug. 23, 2007
4 - 11The Lake Aug. 24, 2007
4 - 12Lost at Sea Aug. 27, 2007
4 - 13Lab Rat Aug. 28, 2007
4 - 14Bragging Rights Aug. 29, 2007
4 - 15Dog Day Afternoon Aug. 29, 2007
4 - 16A Lack of Goodwill Aug. 30, 2007
4 - 17Distant Memory Aug. 31, 2007
4 - 18Hard Luck Sep. 08, 2007
4 - 19Guided Missile Sep. 15, 2007
4 - 20Kadic Bombshell Sep. 22, 2007
4 - 21Canine Conundrum Sep. 29, 2007
4 - 22A Space Oddity Oct. 06, 2007
4 - 23Cousins Once Removed Oct. 13, 2007
4 - 24Music to Soothe The Savage Beast Oct. 20, 2007
4 - 25Wrong Exposure Oct. 27, 2007
4 - 26Bad Connection Nov. 03, 2007
4 - 27Cold Sweat Nov. 03, 2007
4 - 28Down to Earth Nov. 03, 2007
4 - 29Fight to the Finish Nov. 10, 2007
4 - 30Echoes Nov. 10, 2007