Sonic 3’s Jim Carrey got so into playing the new role of Robotnik’s grandfather Gerald that he helped “design the prosthetics”: “No detail was too small”

Despite previously saying he would need a “golden script” to return to acting, Jim Carrey is pulling double duty as both Doctor Robotnik and his grandfather Gerald Robotnik in the upcoming Sonic 3 – even going as far as helping design the elder Robotnik’s prosthetics.

“I mean, not only did he come back, he came back and did twice as much work,” director Jeff Fowler tells SFX magazine in the new issue, which features Doctor Who’s Christmas special ‘Joy to the World’ on the cover and hits newsstands on December 3. The director even joked that he did tempt Carrey back with his unusual demand: “We printed it out with 24-carat ink and delivered it to his doorstep.”