Keys to Lyoko

The Keys to Lyoko are programming codes that play a major role in the Season 2, as X.A.N.A. needed them in order to escape the supercomputer.

Description

According to Sophie Decroisette, the Keys to Lyoko are the source codes and plans of the virtual world itself. The keys provide bearers complete access to Lyoko's functions, such as access to the interface in Sector Five and towers activated by X.A.N.A.. They were given to Aelita by Franz Hopper, who also held them, giving her the ability to deactivate Towers and her powers of Creativity.

During Season 2, X.A.N.A. frequently attempts to take the Keys to Lyoko from Aelita's memory through the Scyphozoa in order to escape from the supercomputer and gain access to the world network. Throughout the second season, the Lyoko Warriors work to protect Aelita's memory from being stolen by X.A.N.A. Though they were unaware of its existence until after decoding Franz Hopper's diary in Revelation. However, in The Key, X.A.N.A. succeeds in getting the Keys to Lyoko from Aelita's memory. Using the Keys, it activated Towers in all four sectors to escape and gain access to the world network and also perpetually darken the virtual world, rendering it lifeless. It was then Franz Hopper stepped in to bring Lyoko back to life, as well as fully restore Aelita's digital memory and past memories.

In Season 4, it is revealed that X.A.N.A. can use the Keys to Lyoko to create smaller copies of Lyoko, dubbed Replikas, inside other supercomputers infected with its multi-agent system, allowing the evil virus to survive and maintain power outside of Lyoko. The enslaved William was also bestowed access to the Keys through his possessed link to X.A.N.A. This allows him to use the Annex Program to access and influence Towers like Aelita, which provides X.A.N.A. with the means to bypass the defenses of Towers it cannot influence on its own, using William's virtual avatar.

Current owners

• Aelita Schaeffer
• X.A.N.A.
• Yumi Ishiyama

Previous owners

• Waldo Schaeffer (deceased)
• William Dunbar (only under X.A.N.A.'s possession)
• Odd Della Robbia (lost his code in Massacre)
• Ulrich Stern (lost his code in Massacre)