Spooky! Dozens of tiny trick-or-treaters invaded the Health Sciences Campus on Halloween for a parade through Keck Hospital, USC Norris Cancer Hospital and Pappas Quad.

James Walker, left, participates in the Halloween parade Oct. 31 on the Health Sciences Campus with his daughter Mirjana, who is dressed as a unicorn with wings. (Photo/Ricardo Carrasco III)

James Walker, left, participates in the Halloween parade Oct. 31 on the Health Sciences Campus with his daughter Mirjana, who is dressed as a unicorn with wings. (Photo/Ricardo Carrasco III)