Franz Hopper

S2, E23: A strange man turns up at the computer lab claiming to be... Franz Hopper. Our heroes can't believe their eyes. But in truth, the man is just another of XANA's spectres which has taken on a human appearance. He cleverly, yet relentlessly sows dissension in the gang so he can wipe out our heroes and lure Aelita to Lyoko so that the Scyphozoa can steal her memory.