Last season, we saw that Bo learned she could feed on multiple people at once, but it made her power mad. As Season 3 began, we saw her covertly feeding on people. This, coupled with a series of unexplained Fae murders, had Dyson wondering - was an out-of-control Bo responsible?
Where was Dyson's old partner, Hale, you ask? With the death of the Ash (head of the Light Fae faction) dead, Hale took over. As was true to form, he clashed with the head of the Dark Fae, The Morrigan (seen here).
Bo and Lauren decided to give their relationship a go, but Bo's increased need for feeding on human chi (which she could get from nookie with Lauren) was insatiable. She needed it all the time! (Bo's sort of like a horny teenaged boy, if you think about it).
While injured on a case, Bo was forced to feed off her ex, Dyson, to heal. This didn't make Lauren happy. Acknowledging Bo's increased need to feed (rhyme check), Lauren agreed to open up the relationship - to ANYONE but Dyson.
Meanwhile, Kenzi developed a weird rash following her encounter with the Norn last season, when she helped free Dyson from his curse. PLUS she was kidnapped and an evil Fae took over her life. Bo rescued her and Kenzi got better, just solidfying the bond between the besties.
Trick figured out what was behind Bo's increased appetite. Her body was preparing for The Dawning, an ancient Fae ritual that decides the evolution of a Fae. If Bo failed, she'd become an Underfae (a mutated and inhuman-looking creature). So, obviously, the stakes were high.
Tamsin worked on delivering Bo to her employer. This included manipulating the growing distance between Lauren and Bo so as to cause their breakup and also making out with Bo. Because who in the cast HASN'T made out with Bo?
An important thing to note is throughout the season, Bo got the sense she was being watched by ... something. This mysterious entity was dubbed "The Wanderer," due to the soft melody of the eponymous Dion and the Belmonts tune that would play whenever the presence was around.
Lauren realized her new boss. Dr. Taft, was totally psycho when he kidnapped her and Dyson. Turns out HE was the one behind all the Fae murders Bo was suspected of. He wanted Lauren to turn him into a wolf Fae.
With help from Lauren, a (shirtless) Dyson killed Taft. Meanwhile, Tamsin prepared to deliver Bo to her mysterious employer but decided against it at the last minute, remaining loyal to Bo (We wonder....did that kiss have anything to do with it?).
When The Wanderer suddenly appeared in the road, Tamsin - wanting to be free of him once and for all - tried to run him over. But he disappeared at the last second, sending the car (with Tamsin and Dyson in it) careening over a cliff.