|“||Dean: (on angels) Because there's no such thing, Sam.
Sam: Dean, there's ten times as much lore about angels as there is about anything else we've ever hunted.
A Unicorn, according to the lore, is a mythological horse creature that has been described since antiquity as a beast with a large, pointed, spiraling horn projecting from its forehead.
In Houses of the Holy, Sam and Dean have an argument on the existence of angels. During the argument, Dean compared their existence to the existence of unicorns.
An employee of the pizza chain, Howard, is using magic to kill children's parents, with a manifestation of their children's fear. One of the victims of circumstances is a man who is killed when he is impaled by the horn of a unicorn.
A unicorn skull could be seen in Magnus' hideout, proving they either do or did actually exist after all.
- Season 2
- Houses of the Holy (mentioned only)
- Season 7
- Plucky Pennywhistle's Magical Menagerie (manifestation)
- Season 8
- Goodbye Stranger (mentioned only)
- Season 9
- Blade Runners (skull only)
- Unicorns have not yet been presented in the series as a true creature. The unicorn who appears in Plucky Pennywhistle's Magical Menagerie was a manifestation of a child's fear, not a real creature.
- Dean does not believe in their existence while Sam was curious, but when they saw that skull in Magnus' home their beliefs may have changed just like when they saw Castiel.
- Meg describes Amelia Richardson as a "unicorn" because she made Sam want to quit the hunting life. Later in the episode, she calls Castiel "my unicorn" when telling Sam to save him. Given their earlier conversation, this is a likely indicator that Meg was in love with Castiel.
- What seems to be a unicorn skull could be seen in Magnus' hideout, however it was never confirmed as a unicorn skull. So the existence of unicorns is still speculation.