Supernatural wrapped up its improbable 15-season run late last year to a largely rapturous response from fans, placing a cap on an epic, 300+ episode journey.
But the show could've been very different were it not for the perfectly-pitched chemistry between stars Jared Padalecki and Jensen Ackles, who as monster-hunting brothers Sam and Dean Winchester created an on-screen bond for the ages.
But just how well do you really know Supernatural, and in particular, how much do you really know about the younger of the two brothers, Sam?
The smarter and more empathetic of the two brothers, Sam is the yin to Dean's yang, but considering the immensity of his development over the course of 15 seasons, you couldn't be blamed for falling short on this devilishly difficult quiz.
Only the most committed, hardcore Supernatural fans have a chance in Heaven or Hell of getting close to 100% - you'll need a firm knowledge of the show's most niche, quirky, and seemingly significant details.
But fear not, because no matter how you do the answers are at the end as ever. Good luck and make sure to try out our other Supernatural quizzes after you've defeated this one.