Garage Kids was a short pilot that introduced the concept of Code Lyoko. The content no longer fits with Code Lyoko cannon; The Lyoko Warriors have their very own exceedingly strong and powerful superhuman mutant powers and abilities on Earth, particularly shown by Yumi's exceptionally strong telekinesis. The atmosphere is darker, perhaps too much so for a kid show. As a preliminary pilot, the characters' voices are different, and there was no mention of Lyoko or Aelita. The virtual world is called Xanadu instead of Lyoko.
Before Season 3 aired, there were two part prequel episodes aired, telling about how Lyoko Warriors met with each other and how they find Lyoko, Aelita and X.A.N.A..
There was no linear storyline in Season 1. The big deal (Time Reversion does not resurrect humans) was only explained in Teddygozilla and the final cliffhanger Code: Earth/False Start; but all other episodes could be seen in any order, or even not seen, and you can understand the whole story. That's why we see Theo in a Season 1 episode, Claustrophobia, and Taelia is fully forgotten after The Girl of the Dreams. Interview with writer team of French forum revealed that it was a channel's exigence: they wanted kids to understand the story even if they miss some episodes or even if the channel released them in the wrong order.
The original episode titles are in French and there are multiple possible translations for some titles. Therefore, the English titles are not official.
Code Lyoko Evolution airs on France 4 in France. During the season's original run, France 4 decided (without consulting Moonscoop) to re-air episodes 1-18 beginning in May, the week after episode 18's original screening, and ending in September. According to TV guides, a second hiatus is looking likely once episode 18 airs again. However, Canal J begins showing the episodes in November, so the final seven episodes should arrive earlier than expected.
Episode 19 was released on iTunes France at the start of the unexpected hiatus, but shortly removed.
During the first hiatus, episodes 20-26 aired on the Hungarian and Romanian channel Megamax.
Cartoon Network USA will not air the season, but instead it will air on Kabillion. A pilot episode of the dub was released on February 28, 2013.
As of April 8, 2011 all seasons are on iTunes France to buy and rent.