As the season builds to its climax, there’s an awful lot to process. A real-life tragedy intervenes in Ellen’s story. Margo needs to communicate information from another tragic event that didn’t happen in the world of “For All Mankind.” A mysterious Soviet engineer comes bearing gifts for Dani. The Vending Machine of Fate beckons to Aleida! And Karen is having a crisis. Meanwhile, on the moon, is someone singing?...