When multiple patients of grief counselor Mia Vallens turn up dead, Dean, Sam and Jack investigate the mystery surrounding the murders and, each inadvertently, are forced to deal with unresolved…

Sam enlists Rowena’s help to track down an old world, powerful family of witches after Dean gets hit by a spell that is rapidly erasing his memory.

When hunters gather together to celebrate the life and tragic death of one of their own, Sam, Dean, and Mary must take action when a demon starts picking off hunters…

Sam and Dean face their biggest challenge yet. Rowena makes her move.

Hoping to find a weapon powerful enough to defeat Amara, Dean convinces “Castiel,” who is still Lucifer, to send him back in time to 1944 to the fated submarine mission…

Sam and Dean investigate a case where people are suffering violent deaths after hearing a mysterious song.

Ryn decides they need to find another solution for housing the mermaids, as hiding them becomes increasingly difficult. Ben becomes a mentor to Levi as he tries to learn how…

Despite Dean’s directive to forget about looking for a cure for the Mark of Cain, Sam continues to do research. Dean suspects Sam is hiding something but decides to focus…

After the massacre at the ranch, Dean, Sam, and Castiel double their efforts to find a cure for the Mark of Cain but there is nothing in the lore that…

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…

When things take a turn for the worse with Sara, Oliver calls in a favor from an old friend who deals in the mystical, John Constantine.

Ben begins to investigate some suspicious overfishing, meanwhile Decker ramps up his efforts to find his escaped mermaid and shows the true extent of his influence.