Matthew John Armstrong’s Heroes character Ted Sprague may be a radiation machine, but can Armstrong save you 15 percent or more on car insurance? Apparently not. ''For the record, I am not the GEICO caveman,'' he told EW in January. But he did have a recurring role on American Dreams, and more recently he made a guest appearance on House (pictured here) as an HIV patient. At one point in the episode, he accidentally coughs HIV-positive blood onto Dr. Cameron (Jennifer Morrison), causing her to flip out, get high off his drugs, and seduce Dr. Chase (Jesse Spencer)! With a few more cameos, Armstrong might have a shot at becoming one of TV's most contagious characters.

See all five of this week's EW Special Collector's Covers featuring the cast of Heroes, each with a hidden clue to decipher about the season finale.