Bryan Cuprill

The murder of a former FBI agent uncovers a decades old conspiracy which may involve Brennan's father.

Buffy starts behaving strangely after sharing a pitcher of Black Frost beer with a group of fellow college students at the campus pub where Xander bartends.

While Adam is recruiting an army of vampires and demons, Riley and Buffy’s passionate lovemaking unleashes a group of poltergeists inside a frat house.

In the conclusion of this two-part episode, after determining the serial killer's identity -- and some of his likely future targets -- the team and the FBI work together to apprehend him while trying to locate and protect the people he's preparing to kill.

Finlay must deal with a bomb planted in her car, while Russell gets a call from someone claiming to be the Gig Harbor killer. Mark-Paul Gosselaar guest stars as twins Jared Briscoe and Paul Winthrop, and Mark Valley guest stars as Detective Daniel Shaw.

Drew is finally awarded an assistant--too bad it's incompetent Kate. Lewis crashes Oswald's car and vows to get him another one.