Anthony Head (BUFFY THE VAMPIRE SLAYER, MERLIN) turns the tables on the Warehouse team with his deadly mastery of artifacts - leading to a shattering confrontation - when he guest stars as the Machiavellian alchemist Paracelsus on Syfy's popular series WAREHOUSE 13.Head's three-episode story arc begins Monday, June 24 at 10 p.m. ET/PT, culminating in the Season 4.5 finale on July 8.