The latest discoveries reveal the dark secrets of the deadliest stars of the cosmos. This episode is a mashup of "Space's Deepest Secrets", S02E08, "Rise of the Monster Stars" and "How the Universe Works", S05E04, "Stars That Kill".

Time travel is less impossible than we think, and the newest discoveries in space and theoretical physics have us on the brink of cracking one of the universe's greatest puzzles.