Robert Englund guest stars as a creepy janitor this week.

The episode takes Booth and Brennan back to the latter's alma mater because an unidentified skull and an upper body is found at Burtonsville High School. From there, Angela helps the two identify the corpse as one of Brennan's former classmates. Might the murder have been committed 15 years earlier?

Booth and Brennan pose as a married couple at the reunion, as they try to interrogate various suspects. This is where Englund's dark-humored janitor comes in.