Weltschmerz (German: [ˈvɛltʃmɛɐ̯ts] literally "world-pain") is a literary concept describing the feeling experienced by an individual who believes that reality can never satisfy the expectations of the mind, resulting in "a mood of weariness or sadness about life arising from the acute awareness of evil and suffering"

So welcome to Alien:Weltschmerz - This weeks special covering the final episode contains spoilers, regrets, sadness, existential world weariness, pleading, barganing, denial and finally acceptance that what on the face of it looked like a bad idea, eventually was. 

Warning: May contain full on mental breakdown of multiple hosts.