Pluribus' A-list cameo actor was approached after Vince Gilligan came up with "the most random" and "most interesting" person to deliver horrifying exposition to Carol

Rhea Seehorn as Carol Sturka holding a glass in Pluribus.

Pluribus has been unhinged and unexpected at the best of times in its first five episodes, but Vince Gilligan's sci-fi mystery upped the ante this week, all thanks to an A-list actor delivering horrifying exposition as a twisted version of themselves.

Spoilers for Pluribus episode 6 follow.