In my opinion this has always been the showpiece of season two, and one of the highlights of the entire series. It features what is certainly one of the most memorable Eagle crashes---with a secondary reentry glider crash thrown in for extra measure (...though I'm still not entirely clear what Helena and Maya accomplished by coming down). Based on a season one script which been floating around for a while, this episode posits a fascinating question: what if a planet were to reject visitors to its surface in the same way a body rejects a virus? A similar idea was presented in War of the Worlds, but not often revisited. The direction, the visuals, the cast (everyone's here) and even the haunting sound design of this planet result in a compelling episode. Upon examination it's clear to see today the episode was written & rewritten to within an inch of its life and only barely sustains the narrative it had been written to realize, so I do recognize its shortcomings. The sets were reused from the previous "Devil's Planet" (...a title, which if you ask me, was in so many ways completely interchangeable with this episode). The title itself was borrowed from a Star Trek episode (and its guest artist was likewise a Star Trek alum, an actor so good that I wondered why on earth we hadn't seen this guy "Travis" before). And as anyone watching nowadays might notice, the resolution comes down to another "deus ex machina" recording of an older alien species realizing, "oh, i found the the solution, and it almost worked, so I'll tuck it away here in the closet so you can use it," that we'd already seen in Freiberger's "Space Warp". The last five minutes of the episode absolutely should not work, but somehow (by intention, accident or editing) manage to thread the needle of Freibergian-inspired nonsense, as the mysterious Burning Bush Catalyst gives Landau a moment to provide another one of Koenig's wonderful classic responses. There was a cinematic quality and an all-out effort to this episode (from cast and crew) that almost, for a moment, gave me a hope of what a season three could have been.