The May 11 episode of Supernatural is called “There’s Something About Mary” and The CW has released an official description with spoilers to promote it. Enjoy:
MARY VS. TONI BEVELL – Sam (Jared Padalecki) and Dean (Jensen Ackles) are alarmed when they learn hunters are being killed by suspicious “accidents” all over the country. They decide it is best to find Mary (guest star Samantha Smith) and make sure she’s safe. Meanwhile, Toni (guest star Elizabeth Blackmore) is back in the states and she and Mary face off. PJ Pesce directed the episode written by Brad Buckner & Eugenie Ross-Leming (#1221). Original airdate 5/11/2017.
UPDATE: We now have some preview images!