give the impression that they had abnormally large heads. The glowing-eye effect, when the children used their mental powers, was achieved by creating animated overlays of a bright white iris; this created a bright glowing iris with a black pupil when optically printed into the film. This technique was used mostly on freeze-frame shot to create the required effect; the only sequence of live motion processed in this way was the scene in which David tells Alan Bernard to "leave us alone" where the eye effect appears as David speaks. The other time David's eyes go from normal to glowing on screen (after one of the girl children is nearly run down by a car), a two shot of the girl and David, is a composite shot split by a slightly jagged black line; the half with the girl is live motion, and you can see her hair moving in the breeze, whereas the half with David is a freeze frame with the eye effect added. A similar split screen effect is used during the first scene of a boy and girl using their powers to stop their 'brother' stealing a puzzle box; the close ups of the mother holding the boy as his eyes begin to glow and she turns to look at him are achieved as above this time without a black line separating the freeze frames of the boy from the live motion of the mother. The final effect of the children's eyes zooming out of the flames of their burning school house utilized multiple exposures of a model head with glowing eyes which the camera zoomed in on. For the original release of the film in Britain, censors removed the glowing eye effects. UK prints without the glowing eyes effects show that during the final sequence, in the close-ups, the kids widen their eyes as they attack Zellaby's mind, unlike the freeze frames with added glowing eyes used in the American prints. Another example is a slight smile that David makes after setting one of the villagers on fire in the UK print; the freeze frames of the American print do not contain such subtle detail. This print also has a credit for being filmed at MGM's British studios that is not on the American prints. Release Theatrical release Given an 'A' certificate by the British censors, the film opened in June 1960 at The Ritz