Over the course of a , the paranormal drama was one of the landmark television shows of the early 21st century, developing a massive and passionate fandom that dominated sites like Tumblr during the height of its popularity. Centered around two monster-hunting brothers, Sam and Dean Winchester (Jared Padalecki and Jensen Ackles, respectively), the show quite literally took fans from the depths of hell to the reaches of heaven and everywhere in between.

Now that it's over for good, a .

The brothers met plenty of interesting characters during the show's run, many of whom went on to become series regulars. One such notable character is Crowley, a demon played by Mark Sheppard who of "Supernatural." Originally born in the 1600s, he became a demon in death and eventually was promoted to King of Hell. Despite his fearsome reputation and title, Crowley maintained a strange relationship with the Winchester brothers, sometimes even offering them help as long as he got something out of the arrangement.

In the end, he sacrificed himself to lock Lucifer (Mark Pellegrino) away in another dimension, giving him a noble — and this time, permanent — death.

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