The third episode of Black Mirror season 6, "Beyond the Sea," features a stellar cast of recognizable names in nearly every role. Written by showrunner Charlie Brooker and directed by BAFTA-winner John Crowley (Brooklyn), "Beyond the Sea" is set in an alternate version of 1969 and follows two men on a dangerous mission who must face an unimaginable disaster. Perhaps the most star-studded episode of Black Mirror season 6, "Beyond the Sea" is a perfect example of what makes the show so popular. From its ensemble to its retro-futuristic approach to storytelling, few episodes of the anthology series have so perfectly summed up the Black Mirror experience.
https://screenrant.com/black-mirror-beyond-the-sea-cast-character-guide/