Season 4 (2007)

William Returns
9.0

August 13, 2007 • 23m

Using the data that Franz Hopper gave them, Jeremie and Aelita succeed in recreating Lyoko, which now holds only Sector Five. Soon...Read more

Double Take
9.0

August 14, 2007 • 23m

In order to compensate for all of William, while under XANA's control, Jeremie sets to work designing new equipment for his friend...Read more

Opening Act
9.0

August 30, 2007 • 23m

Jim's nephew, Chris, the drummer of the Subdigitals, pays a visit to Kadic to look for an opening act for the band's next concert....Read more

Wreck Room
10.0

August 15, 2007 • 23m

There is a new recreation room at Kadic and William's clone is put in charge of it. Meanwhile, Jeremy has developed a program to g...Read more

Skidbladnir
9.0

August 16, 2007 • 23m

The new virtual, submersible "submarine" (as Jeremy calls it) is almost complete, the last step being a secondary program that nee...Read more

Maiden Voyage
9.0

August 17, 2007 • 23m

The gang manages to convince Jeremy to let them test out the Skid. During this test, the navigation system bugs up, leaving the ga...Read more

Crash Course
9.0

August 20, 2007 • 23m

Jeremy decides to teach Odd, Ulrich, and Yumi how to use the Supercomputer in case he or Aelita are unable to, being X.A.N.A.'s fa...Read more

Replika
9.0

August 21, 2007 • 23m

The group travels to one of X.A.N.A.'s replica sectors in the Digital Sea. Meanwhile, Aelita and Odd get into a fight after Odd's ...Read more

I'd Rather Not Talk About It
9.0

August 22, 2007 • 23m

The group turns to Jim for training, so they can be better prepared to fight against X.A.N.A.. However, things go bad when X.A.N.A...Read more

Hot Shower
9.0

August 23, 2007 • 23m

When a comet passes near Earth, X.A.N.A. uses a laser-equipped military satellite to split it into chunks, simultaneously aiming t...Read more

The Lake
9.0

August 24, 2007 • 23m

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 lak...Read more

Lost at Sea
10.0

August 27, 2007 • 23m

Hiroki steals Yumi's diary and Ulrich finds it. Meanwhile, in a new attempt to free William from X.A.N.A.'s evil clutches, Jeremy ...Read more

Lab Rat
9.0

August 28, 2007 • 23m

Jeremie has perfected his "Teleportation" process, allowing him to send his friends to the location of Xana's supercomputer in the...Read more

Bragging Rights
9.0

August 29, 2007 • 23m

Having failed to destroy X.A.N.A.'s supercomputer in the Amazon, the group sets out to finish the job. Meanwhile, Odd's bragging g...Read more

Dog Day Afternoon
9.0

August 29, 2007 • 23m

Odd tries to take Kiwi to Lyoko, but ends up absorbing him instead. As a result, Odd slowly begins to take on dog traits, such as ...Read more

A Lack of Goodwill
9.0

August 30, 2007 • 23m

Jeremy has developed a program to make the William clone smarter, but the learning curve is still problematic, as it tries to flin...Read more

Distant Memory
9.0

August 31, 2007 • 23m

It's holiday time at Kadic and everyone is headed home. Aelita, however, has no home to go to. As she watches over Lyoko, she gets...Read more

Hard Luck
9.0

September 8, 2007 • 23m

When Odd breaks a mirror, a little bad luck follows and jinxes him everywhere, even on Lyoko. A bug in his virtual avatar spreads ...Read more

Guided Missile
9.0

September 15, 2007 • 23m

Jeremy wins a contest to take a flight in an armed fighter jet, even though it is Odd who entered him into the contest. However, j...Read more

Kadic Bombshell
9.0

September 22, 2007 • 23m

When Sissi's pen pal from Iceland, Brynja Heringsdötir, arrives at the school, all the boys swoon over her, making Sissi envious. ...Read more

Canine Conundrum
9.0

September 29, 2007 • 23m

When Kiwi's mindless destruction becomes too much for the group to bear, they force Odd to keep him at the factory. As Odd drops h...Read more

A Space Oddity
10.0

October 6, 2007 • 23m

Because of a surprise dorm inspection, Odd has to convince Yumi to keep Kiwi at her house. Jeremie, meanwhile, has located the nex...Read more

Cousins Once Removed
9.0

October 13, 2007 • 23m

Jeremie's cousin, Patrick, comes to visit. Jeremie isn't entirely happy about it, since Patrick is "super cool" compared to him. D...Read more

Music to Soothe The Savage Beast
9.0

October 20, 2007 • 23m

Aelita's first concert with the Subdigitals is coming up, but Aelita's stage fright threatens to get the better of her. Odd meanwh...Read more

Wrong Exposure
9.0

October 27, 2007 • 23m

Aelita finds a photo of herself with Franz Hopper at the Hermitage, with a mathematical equation in the background. Jeremie discov...Read more

Bad Connection
10.0

November 3, 2007 • 23m

Odd is presenting one of his films, but is unhappy because his parents are coming. According to him, they never find fault in anyt...Read more

Cold Sweat
10.0

November 3, 2007 • 23m

When an embarrassing picture of Yumi is printed in the Kadic newspaper, she turns to Odd as the source. He manages to get Ulrich t...Read more

Down to Earth
10.0

November 3, 2007 • 23m

In order to defeat XANA, whom they have vastly underestimated, Jeremie plans to design another multi-agent system to combat him. T...Read more

Fight to the Finish
10.0

November 10, 2007 • 23m

With the Skid gone and XANA's Replikas at unmanageable numbers, Jeremie continues work on his multi-agent system. Meanwhile, Aelit...Read more

Echoes
10.0

November 10, 2007 • 23m

With their mission completed, the group looks back on all their fond memories of Lyoko. Sissi, meanwhile, plants a tracking device...Read more