During a training mission on the Cortex, the Megapod bugs up and Jeremy is forced to figure out how to repair it. Just as he does so, the superscan finds an activated tower on the Cortex. But when they arrive on site, they find the tower has a purple halo. It has been activated by Tyron, and the Lyoko Warriors are soon surrounded by Ninjas, and Odd, Aelita and Ulrich become trapped in a temporal bubble that sends them back to that morning's gym class, repeating it dozens of times over. They must find a way to contact Jeremy to tell them what happened so that he can destroy the bubble before Tyron uses its signal to track their location on Earth.
Meanwhile, Laura finds the card given to her in An Assured Professional Future. Not able to remember where she had gotten it from, she dials the number, arranging for a meeting via webcam. Tyron speaks to her in person, but becomes disinterested in her when she reveals that she has never worked with a quantum supercomputer before. Just before hanging up, Tyron shows her the holographic images of Odd, Ulrich, Aelita, Yumi and William's virtual avatars, asking them who they are. Laura tells him that they look just like Jeremy Belpois' friends. Tyron hangs up and thanks her greatly for her help, now intending to find Jeremy.
Nakon što se na misiji u Korteksu megapod sasvim iznenadno dematerijalizuje, izgleda da je sve u redu dok se ne registruje aktivirani toranj. Kada mu se grupa približi, DŽeremi shvata da nije Ksena koji ga je aktivirao, već Tajron; toranj je samo zamka i to se vidi čim su svi (sem Jumi) zarobljeni u crnoj sferi. Oni se ne nalaze u paralelnom svetu već u vremenskoj petlji. DŽeremi shvata da je petlja, u suštini, Tajronov plan da locira akademiju i Lioko ratnike. Međutim, preusmeravanjem energije Jumi i DŽeremi (u međuvremenu je i Vilijam zarobljen u sferu) uspevaju da unište vremensku petlju, a samim tim i sferu.
أثناء مهمة تدريبية على القشرة، تتعطل ميجابود ويضطر جيرمي إلى معرفة كيفية إصلاحها. عندما يفعل ذلك، يجد الماسح الخارق برجًا نشطًا على القشرة. لكن عندما وصلوا إلى الموقع، وجدوا أن البرج به هالة أرجوانية. تم تنشيطه بواسطة تايرون، وسرعان ما تمت أحاطتهم بالنينجا، وأصبح اود واليتا واورليش محاصرين في فقاعة زمنية تعيدهم إلى فصل الصالة الرياضية في ذلك الصباح، وتكرر ذلك عشرات المرات.
