EXCLUSIVE
"Buffy the Vampire Slayer" star Nicholas Brendon was arrested Friday night in Idaho ... and his mugshot looks like Xander got into it with one of the bloodsuckers his co-star famously fought.
Brendon was in Boise for a Comic Con event when he got busted around 10PM for allegedly causing "malicious injury to a property" ... according to police -- but so far it's unclear what he was actually doing to get arrested.
Nicholas was hit with 2 misdemeanor counts -- including one for resisting/obstructing officers.
We reached out to Nicholas' rep ... so far, no word back.
