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Code Lyoko

Season 1 Episode 19: Frontier

Jeremy convinces Yumi to send him to Lyoko so he can speak in-person with Aelita, but when she hits the wrong key, he becomes stuck between worlds. While they struggle to bring Jeremy back, XANA unleashes a deadly attack on Aelita.

Season 1 Episodes:

Episode 1 Teddygozilla

1. Teddygozilla

Aired: Sep 3, 2003

A student named Milly seeks the comfort of her teddy bear after being embarra...

Episode 2 Seeing Is Believing

2. Seeing Is Believing

Aired: Sep 10, 2003

After a lecture on nuclear power in class, Odd begins casting for a tradition...

Episode 3 Holiday in the Fog

3. Holiday in the Fog

Aired: Sep 17, 2003

To keep an eye out for X.A.N.A., Jeremie decides to stay back at school for t...

Episode 4 Log Book

4. Log Book

Aired: Oct 1, 2003

Sissi has found something very special and dear to Ulrich, his diary! Unfortu...

Episode 5 Big Bug

5. Big Bug

Aired: Oct 1, 2003

Crashing the city's communications device with a virus, X.A.N.A. jeopardizes ...

Episode 6 Cruel Dilemma

6. Cruel Dilemma

Aired: Oct 8, 2003

Jeremie is working on the materialization program, and Odd accidentally finds...

Episode 7 Image Problem

7. Image Problem

Aired: Oct 15, 2003

Yumi is held captive in Lyoko while her evil clone attempts to destroy the he...

Episode 8 End of Take

8. End of Take

Aired: Oct 22, 2003

A movie director begins filming in our heroes' factory, so Ulrich works on th...

Episode 9 Satellite

9. Satellite

Aired: Oct 28, 2003

When all the students' cell phones goes off in class, it starts Sissy on a pe...

Episode 11 Plagued

11. Plagued

Aired: Nov 11, 2003

When the gang learns that if Jeremy passes a few tricky quizzes, that he'll g...

Episode 12 Swarming Attack

12. Swarming Attack

Aired: Nov 18, 2003

Ulrich is fussing over a mysterious letter found slipped under his door one n...

Episode 13 Just in Time

13. Just in Time

Aired: Nov 25, 2003

Jeremy has trouble materializing Aelita, and actually makes matters worse. Wh...

Episode 14 The Trap

14. The Trap

Aired: Dec 2, 2003

XANA takes control of the factory and traps Yumi, Ulrich and Sissi in the ele...

Episode 15 Laughing Fit

15. Laughing Fit

Aired: Dec 9, 2003

XANA unleashes an attack of laughing gas on the school, inducing fits of laug...

Episode 16 Claustrophobia

16. Claustrophobia

Aired: Dec 16, 2003

X.A.N.A. short-circuits the Kadic cafeteria in order to trap Odd, Ulrich, and...

Episode 17 Amnesia

17. Amnesia

Aired: Dec 23, 2003

XANA creates viruses which attack human brains, causing amnesia. Sissi takes ...

Episode 18 Killer Music

18. Killer Music

Aired: Dec 30, 2003

A new song Odd downloads sends him into a coma, and the same song is passed t...

Episode 19 Frontier

19. Frontier

Aired: Jan 6, 2004

Jeremy convinces Yumi to send him to Lyoko so he can speak in-person with Ael...

Episode 20 The Robots

20. The Robots

Aired: Jan 13, 2004

Both Herb & Jeremy are in a robot competition, Herb with "Iron Sissy", and Je...

Episode 21 Zero Gravity Zone

21. Zero Gravity Zone

Aired: Jan 20, 2004

XANA creates an ever-increasing zero-gravity zone on the field during the Kad...

Episode 22 Routine

22. Routine

Aired: Jan 27, 2004

Tired of the same old routine of fighting X.A.N.A., Ulrich decides it's time ...

Episode 23 Rock Bottom?

23. Rock Bottom?

Aired: Feb 3, 2004

In preparation for a secretly-planned dance party at Yumi's house, Odd gets i...

Episode 24 Ghost Channel

24. Ghost Channel

Aired: Feb 10, 2004

XANA traps Ulrich, Odd, and Yumi in a virtual universe and they don't realize...

Episode 25 Code: Earth

25. Code: Earth

Aired: Feb 17, 2004

As Jeremie is perfecting his materialization program for Aelita, Yumi, Ulrich...

Episode 26 False Start

26. False Start

Aired: Feb 24, 2004

When Jeremie discovers a fatal connection between a materialized Aelita and t...

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Info about Code Lyoko

Seasons: 4

Current Status: Ended

Network: France 3

Production Country: France

Genres:Comedy, Adventure, Family, Sci-Fi, Animation, Action

Code Lyoko: Where to Watch Online in United Kingdom?

It is also possible to rent or buy on AppleTV, Amazon online.