His breakout role was as George McFly in Robert Zemeckis's Back to the Future, an international box office success in 1985; his character was the father of Marty McFly, despite being three years younger than Michael J. Fox in real life. Glover and the producers could not agree on suitable terms for him to appear in the sequels, so the role of the character was greatly reduced and recast. In Back to the Future Part II, Zemeckis reused brief footage of Glover which had been filmed for the first film. Glover was billed as "George McFly in footage from Back to the Future" in the closing credits. The older footage was combined with new footage of actor Jeffrey Weissman wearing a false chin, nose and cheekbones, and various obfuscating methods – in the background, wearing sunglasses, rear shot, upside down – to play the role of George McFly. Because these methods suggested that Glover himself had performed for the film, he sued the producers on the grounds that they had used his likeness without permission, as well as not having paid him for the reuse of the footage from the original film. As a result of this suit, there are now clauses in the Screen Actors Guild collective bargaining agreements which state that producers and actors are not allowed to use such methods to reproduce the likeness of other actors.