I think this is one of the first "something Jeremie programs goes wrong" episodes. When he manages to materialize one of Aelita's hairs to Earth, everything seems to have gone fine... That is, until he realizes he bugged up her program, and if she enters a tower she'll vanish forever. And of course, XANA picks that moment to launch an attack...
For the J/A fan, this was a pretty good episode. It had a sweet little moment at the end, plus a few things earlier on as well. It's also another one where Aelita shows that she puts everyone else's safety ahead of hers, and will willingly sacrifice herself for a good cause. ...Besides, the scene between Odd, Yumi, and Ulrich (mainly Ulrich and Yumi) near the beginning can't be beat ;P xD
Everyone else's thoughts? xD