When you watch this episode, understand that SOME of it might be a bit confusing. That's because you are given a small glimpse of what is occurring and in season 3, this SAME episode is repeated but from an entirely different perspective--giving you a fuller picture of what is occurring. Once again, the genius of the series' main writer Michael Scraczynski shines through, as he plotted many story elements and weaves them in and out of various episodes--never forgetting the loose threads and expertly bringing all these elements into one giant tapestry. This really is something no other sci-fi series has ever done. While other sci-fi shows may be a recurring plot, I have never seen a show like B-5 where even small characters play important parts in later shows.
In this episode you learn that the previous station, Babylon 4, disappeared without a trace a few years earlier. Now, for some odd reason, B-4 reappears and seems to be stuck in some time shift. So, Sinclair and his team assemble a rescue mission to evacuate the old station before it vanishes again, as it's re-appearance is very unstable. While the quirky character of Zathras and the odd and surprising ending may confuse you, please bear with it. The episode is still exceptional and you will later learn in season 3 just how amazing and exceptional it really is when all the mysteries of the episode are revealed.