Sam & Dean Face Their Biggest Challenge Yet on Tonight's 'Supernatural'

Sam (Jared Padalecki) and Dean (Jensen Ackles) creep up on a door in this still from tonight’s all-new episode of Supernatural.

In “We Happy Few,” Sam and Dean face their biggest challenge yet.

Meanwhile, Rowena (Ruth Connell) makes her move.

PHOTOS: Check out the latest pics of Jared Padalecki

Don’t forget – Supernatural airs TONIGHT, May 18 @ 9PM on The CW.

Watch a promo for the episode below and tell us what you think!

10+ stills from the episode inside…