Sam and Dean are asked to investigate the murder of a childhood friend, calling them back to a motel from their past and perplexing the brothers with a case they…

When DeVoe assaults an A.R.G.U.S. facility to complete his Enlightenment Machine, Barry realizes the only way he can stop him is if he allows Cisco and Caitlin to accompany him…

When Barry needs help transporting a dangerous meta, he calls on a new friend for help – Leo Snart AKA Citizen Cold. Meanwhile, Cisco becomes suspicious of Harry.

As Barry’s trial for the murder of Clifford DeVoe begins, Iris and Joe must decide how far they are willing to go to keep Barry out of prison.

Crowley turns to Dean for help to locate the First Blade, the only weapon that can kill Abaddon. However, they soon discover that the trail leads to Cain… the Father…