This was the sixth and last time that Peter Cushing portrayed the role of the obsessively driven Baron Frankenstein, a part he originated in 1957's Curse of Frankenstein. Cushing had long been known throughout his career for his meticulous attention to detail, even in the planned handling and usage of props. For this film, he helped to design the wig that he wore, but years afterward regretted the outcome, and jokingly quipped that it made him look more like stage and screen actress, Helen Hayes. But Cushing's dedication to his role was never truly dampened, and at age 59, looking somewhat gaunt and fragile, he still insisted upon performing a daring stunt which required him to leap from a tabletop onto the hulking creature's back, spinning wildly in circles in order to subdue the monster