Jim Carrey sits down with ET’s Nischelle Turner in London to chat about ‘Sonic the Hedgehog 3,’ in theaters Dec. 20. The actor opens up about playing two characters for the film, Dr. Robotnik and his grandfather, and shares why being a part of this franchise means so much to him. Jim also reflects on some of his most iconic films, including ‘Dumb and Dumber,’ ‘The Mask’ and ‘Ace Ventura: Pet Detective,’ which are all celebrating 30 years. Plus, he shares how ‘gratifying’ it’s been to see his 2000 version of ‘How the Grinch Stole Christmas’ become a holiday staple.