The article contains major SPOILERS for The Winchesters season 1, episode 13How the Supernatural cameos were chosen for The Winchesters finale is explained by showrunner Robbie Thompson. Though the episode concluded the prequel’s main story, with Dean (Jensen Ackles) meeting a multiverse version of John (Drake Rodger) and Mary (Meg Donnelly) and helping to save the day, The Winchesters finale was also notable for appearances by some Supernatural actors. In addition to Ackles, both Jim Beaver and Alexander Calvert return in significant ways. They play Bobby Singer and Jack, respectively.
