Ultimate Fantastic Four #19 2005

Ultimate Fantastic Four #19, "Think Tank: Part 1," sees the team return to a booby-trapped Baxter Building after a mission. They confront a devious new antagonist, Rhona Burchill, who makes her first appearance in this issue, along with Robbie the Robot. Reed Richards finds his intellect challenged as Burchill seals them within the building with limited oxygen. This issue, part of Mike Carey's run, is notable for introducing a key foe and features the distinctive art of Jae Lee.