Check out the synopsis for Supernatural episode 8×21, titled “The Great Escapist,” below.

The official press release has the following information about the episode:

FEELING LUCKY TONIGHT? — When Sam (Jared Padalecki) and Dean (Jensen Ackles) receive a distressing video message from Kevin Tran (guest star Osric Chau), they set about trying to uncover the Third Trial. The boys make a discovery that sends them to a casino in Colorado, to find a mysterious recluse (guest star Curtis Armstrong) who may be able to fill in the holes in Kevin’s research. Meanwhile, Crowley (guest star Mark Sheppard) is on a winning streak. Castiel (Misha Collins) tries to elude Naomi (guest star Amanda Tapping) and the angels hunting him. Robert Duncan McNeill directed the episode written by Ben Edlund (#821).

The last we saw of Kevin, it appeared that Crowley had found him in hiding after Kevin had repeatedly heard the king of Hell’s voice in his head. Meanwhile, Sam completed the second trial of the three required to seal the gates of Hell permanently — rescuing an innocent soul (Bobby) from Hell and releasing it to Heaven.

Naomi also struck up a hesitant truce with Dean, citing the fact that both she and the Winchesters want to seal the gates of Hell permanently. She demonstrated her apparent trustworthiness by confronting Crowley when he attempted to prevent Bobby’s soul from rising to Heaven.

However, with Naomi still looking for Castiel, who disappeared with the angel tablet, it’s unclear how far the brothers can trust her.

“The Great Escapist” airs Wednesday, May 1 at 9:00 p.m. ET.