10 Jo Harvelle Returns As A Ghost For Dean's Trial

Jo was the inexperienced hunter working with the Roadhouse crew alongside her mother, Ellen. She wanted to prove herself as a hunter and impress Dean, on whom she had a crush. Jo is killed by a hellhound in season 5, helping to save Dean in the process.

Jo would return as a ghost two seasons later. She appears as a witness to Dean's trial, but Osiris fails to convince her to testify against him. She is compelled against her will to try to kill Dean, but luckily snaps out of it before she can cause any injury.

9 John Winchester Time Travels

Jeffrey Dean Morgan, who sacrifices himself in the first episode of season 2 to save Dean, reprises his role as Sam and Dean's father in season 14, but as a past version who has jumped forward in time. For the 300th episode, a 2003 John ends up traveling to 2019 and meeting his sons. In the emotional episode "Lebanon," the brothers find a treasure in a pawn shop that grants its owners their wishes.

Although they try to use the pearl to banish Michael, they ultimately summon John to the bunker, upsetting events that have already happened. After the bunker is attacked by a version of the angel Zachariah who never died, and a version of Castiel who never got to meet the Winchesters, they realize their father can not stay. They are forced to send their much-missed patriarch back to his time, fearing his presence could destroy the world.

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