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A memory fragment is a piece of someone's memory. Since the beginning of Code Lyoko, X.A.N.A. has been after a piece of Aelita's memory . In the episode The Key, X.A.N.A. achieved in retrieving the memory fragment from Aelita and used it to escape from the supercomputer.

v · d · e Lyoko
Characters	Franz Hopper X.A.N.A. Lyoko Warriors Jeremie Belpois Aelita Schaeffer Odd Della Robbia Ulrich Stern Yumi Ishiyama William Dunbar
Locations	Sectors Ice Sector Desert Sector Forest Sector Mountain Sector Sector Five Arena Celestial Dome Core Zone Data Tunnels Skidbladnir Hangar Heart of Lyoko Other Digital Sea Virtual Limbo
Hardware	Factory Interface Holomap Scanner Supercomputer
Virtual Objects	Eye Scanner Lyoko Wires MegaPod Overboard Overbike Overwing Skidbladnir Nav Skid Tower Way Towers Transport Orb Virtual World Shell
Programs	Annex Program Anti-X.A.N.A. Program Avatar Codes Lyoko Earth X.A.N.A. Scipio Deletion Devirtualization Digital Genetic Code Energize ID Card Keys to Lyoko Life Point Memory fragment Pulsations Sector Alteration Program Simulation Bubble Superscan Telephone Vehicle Virtualization Program
Weapons	Lyoko Warriors Katana Laser Arrow Tessen Fans Zweihänder Monsters Circular Laser Flying Mine Hallucinogenic Beam Laser Pulse Beam
Powers	Catclimb Energy Beam Energy Fields Enhanced Marksmanship Feline Execution Monster Riding Second Sight Second View Shield Super Smoke Super Sprint Telekinesis Teleportation
Other	Eye of X.A.N.A. Gunship Virtual Weather