Ghost Possession
From Super-wiki
A rare occurence in which an Angry or Vengeful Spirit can take over the body of a living person in order to meet their goals.
In 4.13 After School Special, the ghost of bully turned bullied boy Dirk McGregor possesses the bullied and kills their bullies. Afterwards they remember what happened but report the inability to control their actions.
In 7.22 There Will Be Blood and 7.23 Survival of the Fittest, Bobby Singer possesses a maid named Louise to get revenge on Dick Roman after turning into a Vengeful Spirit, but lets her go once he realizes what he's become and regains control of himself.
