S12, E13: When Sam and Dean look into a murder at a museum, they learn a ghost from a merchant ship that sunk in 1723 may be at the heart of the mystery. After realizing "The Star"€ was the same ship that Crowley's son Gavin MacLeod (guest star THEO DEVANEY) should have been aboard, they enlist help from Rowena to track Gavin down. Meanwhile, Kelly Kline (guest star COURTNEY FORD), still pregnant with Lucifer's child, takes refuge with a demon after an angel attempts to kill her.