'For All Mankind' season 4 episode 7 review: Teases a spectacular end of season run

Sitting at a table are three people with very serious expressions. In the background there are more people standing, some with their arms crossed. They are all wearing the same gray jumpsuit.

"Crossing the Line" may be the shortest episode of the season so far, but that doesn't mean it's short on incident. As tensions at Happy Valley escalate and the Helios workers' strike brings the base to a standstill, both sides go to extreme measures to turn the dispute in their favor — with literally explosive consequences.

The shockwaves of exiled NASA head Margo Madison's (Wrenn Schmidt) decision to go public on her defection to the U.S.S.R. are still being felt, particularly by former protégée Aleida Rosales (Coral Peña), who's far from happy about her old boss's unlikely resurrection. Meanwhile, Helios CEO Dev Ayesa (Edi Gathegi) — a peripheral player for much of the season — makes arguably the boldest (and undoubtedly the most ludicrous) move in "For All Mankind" history.