Professor Stephen Hawking has filmed a cameo appearance on the geek-comedy series The Big Bang Theory. The world-famous scientist suffers from motor neurone disease and uses a speech-generating device to communicate, as he cannot communicate vocally. Metro newspaper have reported that Hawking will star in an episode of the comedy series, sharing a scene with Jim Parsons' character, Sheldon Cooper.
Metro revealed that Hawking had been invited onto the show previously but had been forced to turn the offer down, as he had been too ill to take part. The scientist no longer uses the robotic voice with which he has become synonymous. His new voice synthesizer will be revealed when he appears on the sitcom. The Big Bang Theory has previously featured guest appearances from Summer Glau and Wil Wheaton. The scriptwriters have previously made mention of Hawking, when Howard Wolowitz (played by Simon Helberg) left a voicemail on Sheldon's phone, pretending to be the 70 year-old author of A Brief History of Time. The message said "I wish to discuss your theory of black holes. Meet me at Randy's Donuts."