Bo and Dyson team up to track down a stolen Mongolian Death Worm on behalf of Dyson's old wolf pack mate. When things get complicated, Dyson finds himself reliving his medieval days – tormented by the hard choices he once had to make, and fighting in the present not to repeat past mistakes.

Bo risks her freedom to do a favor for Lauren, only to discover she’ll have to do it “au naturel.” The new Ash is revealed and Bo’s new appetites shock…has she not recovered from last season’s battle after all?

Chaos strikes during a daring attack on The Dal, leaving the fate of one of the gang in the balance. Meanwhile, The Morrigan leaps on the opportunity to ignite the tensions between Light and Dark… catching Kenzi and Hale in the crossfire.