Video : Les sans-codes

A tower is activated and a spectre is sent after Odd, taking the appearance of a football player. Aelita and Ulrich go to deactivate the tower, but when they reach it, Aelita is unable to enter. The tower deactivated itself because Odd lost the last of his source codes to the spectre.

Odd then formulates a protection plan where the "codeless" protect the people who can't return to Lyoko for 12 hours, and who have nowhere to hide from XANA's spectres. Another tower is activated and Ulrich and Aelita are shut in a closet under Odd's protection while William and Yumi are sent to Lyoko. William seems upset about being referred to as "codeless," as it means he can't deactivate towers, and isn't considered as important as the others. When he and Yumi reach the tower they're confronted by an evil clone of William who plays on his doubts, telling him that he's being used by the gang, especially Yumi. He and the clone then chase after Yumi while the footballer spectre finds Ulrich and Aelita and corners them.

Odd realises that the sound system can be used to disrupt the spectre and stop it from advancing, so he starts singing Frère Jacques over the PA to delay it. Meanwhile, William turns on his clone, allowing Yumi to get to the tower and deactivate it.

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S01E16 - Confusion