[s6e21] Let It Bleed -

Bobby discovers that on March 10, 1937, Lovecraft and a group of cultists successfully opened a door to Purgatory.

Suffers possession and a near-fatal injury before her memory is wiped. [S6E21] Let It Bleed

Critics and fans often highlight this episode as one of the season’s most emotional hours. The performance by was widely praised for conveying Dean's absolute heartbreak during the memory-wipe scene. While some viewers felt the H.P. Lovecraft subplot was less engaging than the personal stakes of the abduction, the episode is generally regarded as a powerful setup for the season finale. Bobby discovers that on March 10, 1937, Lovecraft

Betrays Castiel's plans to help the brothers find Crowley’s warehouse. The performance by was widely praised for conveying

The primary conflict is driven by , who kidnaps Dean’s former girlfriend, Lisa Braeden , and her son, Ben , to force the Winchesters to stop their pursuit of Purgatory.