The intro episode for Theo! ...Who really doesn't play any further part in the series afterwards (other than as an extra in the background...and one of the notable zombies in "Attack of the Zombies" ).
Granted though, he has to be Sissi's first crush (other than Ulrich )...and one of the few people to make Herb jealous (other than Ulrich *snerk* ).
Interesting mode of attack for XANA...mess with the circuits to trap everyone inside and start overloading the cafeteria's structure. Decently effective to say the least, since it kept two of the Lyoko warriors trapped and left Yumi and Aelita to fend for themselves.
What did you think about this episode? Post below.