The latest episode of HBO's post-apocalyptic thriller drama deviated from the game’s narrative to tell a deeper story about the characters, including Gail and Eugene.

A series of flashbacks traced the evolution of Joel and Ellie’s relationship in Jackson, Wyo., filling in some blanks about her current state of mind.

Whether you are a fan of space exploration history or of the game on which the series is based, "The Last of Us" has just delivered a real blast from the past.