Roger has finally perfected the giant Light-Sabre... or some similar scary device.
Doc is looking in exactly the wrong direction to even glimpse it out of the corner of his eye. Cara will have her back to it as she prepares the steaks. We will just have to wait for the glow-in-the-dark mushroom cloud. (Doc N has promised a return to mayhem, disasters and explosions, and Roger is a likely vehicle to get there, after all.....)