Swarming Attack

Sissi, the school's babe-in-waiting, plucks up the courage to tell Ulrich that she has a crush on him. Far from being flattered, Ulrich bursts out laughing, hurting Sissi's feelings. Determined not to be the fool in this situation, Sissi decides to get her own back by stirring up trouble between Ulrich and Yumi. While all this is going on, the X.A.N.A super-calculator has found a new way to attack our planet. It has contaminated the wasps on the school grounds and is using them to attack! Yumi, Ulrich, Odd and Jeremy will have to fight against this new menace. But Sissi's meddling have sown seeds of doubt in the team members, and it's badly affecting their team spirit...

Jeremie Belpois, Ulrich Stern, Odd Della Robbia, Yumi Ishiyama, Aelita, X.A.N.A., Elisabeth "Sissi" Delmas, Dorothy, Mrs. Suzanne Hertz, Herb Pichon, Nicolas "Nick" Poliakoff, Jim Morales, Tamiya Diop, Milly Solovieff, Jean-Pierre Delmas, Kiwi, Emily

There are 52 episodes planned.

Air dates shown are for those in the U.S. on Cartoon Network. In fact, the series first aired on France 3 on September 3, 2003.