"The Girl Next Door"

Season 7, Episode 3

"The Girl Next Door" is a key episode in Season 7 in which Dean does one of the worst things he's ever done - an action that makes him much scarier than the focus monsters of the episode, a kitsune.

At the end of the episode, Dean confronts the kitsune, Amy Pond, who Sam let live previously.

Explaining that she'll just kill again, Dean murders her in cold blood. While this may not seem as scary as it seems, the kitsune really wasn't that scary and seemed almost like a knockoff werewolf. As such, Dean going behind Sam's back and murdering Amy made him look both terrifying and a jerk.

"The Bad Place"

Season 13, Episode 9

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Dean's rough demeanor, a , once again makes him quite terrifying to watch in this episode. During this episode, Sam and Dean find Jack, who is using dreamwalkers to try to reach Mary after he discovers she is stuck in Apocalypse World. But when angels track them down, Dean holds Jack's latest dreamwalker ally, Kaia, at gunpoint and forces her to come along with them and help them.

Although this is to protect her from the angels, the real ones that are killing the dreamwalkers Jack is getting to help him, but that doesn't make Dean any less scary.

He's certainly scarier than the angels.

"The Things We Left Behind"

Season 10, Episode 9

is clearly one of , and he continues showing off his scary side in "The Things We Left Behind." After rescuing Claire from the humans that have her captive, Dean, who at this point still has the Mark of Cain, is knocked down by the group's leader.

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