On this week's episode of Supernatural…
Sheriff Jodi Mills calls Sam and Dean about an odd case of mummified deaths in Canton, Ohio.
They track down the man they think is responsible, but a flash of light sends the man and Dean back to 1944. Turns out he is Chronos, the God of Time.
Dean teams up with Eliot Ness, who happens to be a hunter, and the two track down Chronos.
Meanwhile, back in present time, Sam and Sheriff Mills attempt to find a way to summon Chronos at the same time he is holding on to Dean.
Dean writes a letter and plants it in the house Sam is currently staying to reveal when to bring him back.
Chronos and Dean return to the present time and Sam kills Chronos. Right before he dies, Chronos predicts that Sam and Dean's future ends with black ooze.