Well, this episode finally started to piece together many of the disparate aspects that we've bemoaned were drawn out and incoherent, ever since the first series. There are aspects shown in Episode 5 which would require you to recall the very first episode of series 1 with Sam Neill's character and his brief appearance. Poked by an alien appendage, he's assumed dead but now we see some hint that this may not be the case and in fact the mothership may well be taking visitors.
We also, and it's hard to believe I'm writing this, but we're also seeing the first communication with these visitors after 15 episodes and they speak our language. Imagine that. The humans could have taken a leaf out of Amy Adam's character in Arrival and tried communication at the outset.
The billionaire egoist is still annoying and his presence adds nothing but to drag the whole thing down, although his looks are probably his greatest charm. Likewise, the ongoing sub-story of our wandering family and sleuthing soldier is interminably drawn out and frustrating, particularly as the pace keeps shifting from what has become a somewhat compelling storyline with Mitsuki and her attempts to understand and communicate with the aliens, versus these padded, filler, sub-plot wanderings. They are however starting to tie all of that together and in that respect it helps one to forgive what's gone before to some degree.
There may well be redemption in this series yet and this is the most interesting episode so far, but it's one episode good, one bad, so let's wait and see.