On April 9, 2011, Romita was one of 62 comics creators who appeared at the IGN stage at the Kapow! convention in London to set two Guinness World Records, the "Fastest Production of a Comic Book" and "Most Contributors to a Comic Book". With Guinness officials on hand to monitor their progress, writer Millar began work at 9 a.m. scripting a 20-page black-and-white comic book of his character Superior, with Romita and the other artists appearing on stage throughout the day to work on the pencils, inks, and lettering, each drawing a panel. The book was completed in 11 hours, 19 minutes, and 38 seconds, and was published through Icon on November 23, 2011, with all royalties being donated to Yorkhill Children's Foundation.