Next week on Supernatural the Winchesters finally find Kelly Kline. More specifically, 

"Sam (Jared Padalecki) and Dean (Jensen Ackles) get a lead on Kelly Kline’s (guest star Courtney Ford) whereabouts. Mick (guest star Adam Fergus) drops by the bunker unexpectedly and decides to join the hunt." 

Promo:

 

"The British Invasion" was directed by John Showalter and was written by Eugenie Ross-Leming and Brad Buckner. It will air next Thursday, April 6 on The CW.