At Comic-Con, Robert Downey Jr. made every geek in attendance appreciate the vocal stylings Luther Vandross. The "Iron Man" star literally danced into Hall H at the start of the Marvel Studios panel on Saturday night while Vandross' song "Never Too Much" blared over the speakers. Looking exactly like his onscreen alter ego Tony Stark (the billionaire businessman inside the Iron Man suit), Downey was in good spirits when he took the stage, laughing and teaching math as the assembled throng of geeks cheered wildly. "I have three questions," Downey said.