Sleepwalkers (1992)

The special makeup effects for Sleepwalkers were realized by Alterian Studios , with Tony Gardner acting as project supervisor. According to the credits, Tom Hester was responsible for the actual creature design, with Brian Penikas, John Blake and Mike Smithson credited as sculpterers.

Alice Krige and Brian Krause played the two werecat 'sleepwalkers' Charles and Mary Brady; their early stages of transformation were achieved as facial makeup appliances that gave them a more feline appearance. Krige recounted in an interview for Grimmfest that the prosthetics were hard to emote and talk in, due to their immobility. The dying Charles was realized as a more advanced facial and chest prosthetic applied to Krause, with the face sculpted to be more wrinkled with wounds.

The actual transformations were achieved as digital effects, using similar software techniques as the werewolf transformations in Anthony Hickox's Full Eclipse (which Alterian had also provided the special makeup effects for) and Eric Red's Bad Moon. Several prosthetic appliances and masks were sculpted and filmed, along with Krause himself and the sleepwalker bodysuit; the footage would be blended together with the software to provide a continuous transformation in one cut. Pacifics Data Images, who supplied the morphing effect, had previously worked on Michael Jackson's Black-and-White music video using the same techniques.

Alterian fabricated two sleepwalker bodysuits to represent Charles and Mary; the Mary suit was sculpted with visible breasts to differentiate it from from the Charles suit. The suit heads were fitted with animatronics in order to blink and open the mouth, and the suits were coated in grease to make the suits not be obviously made of latex.