I quite liked the ep. It wasn't bad, though I am getting a bit tired of not identifying with any characters. Even Eli's wearing a bit thin now. They're all sort of okay, but they're quite one-note (I don't want to say one-dimensional, because that implies a different level of crappyness). They're just not very engaging or interesting characters and we don't learn much about any of them. I really didn't give two shits about Chloe being taken. She's useless. Giant hole gets drilled through the hull while the ship's under attack and she goes right up to it to have a look, unarmed. Idiot. You would've thought by now that they'd have found a way to say "oh, Chloe, you're not really useless at all, we need you because you're our heart/moral center/something else", but there's been no attempt to give her a role. She's just a damsel in distress.
Anyway, so I'm surprised they brought Rush back so fast, but the alien encounter was fairly good. Young being such a dick all the time (even to Eli) is annoying. Are we supposed to even care that there's a coup against him? I'm on Rush's side, even though I agree they have little justification for it.
Young ended up swapping with the alien when he was meant to be going to Earth to give a debriefing about Rush. We don't know how the mix up happened, but it looked as though it was accidental/coincidental that it was the same ship that was about to attack them. The aliens didn't notice the swap overs.