Now, ahead of the Group C Finals on Thursday (Fox, 8/7c), it’s time to revisit our comprehensive collection of clues. Our mission is clear but the work is cut out for us: Identify the celebs beneath the costumes before they’re unmasked. Is Sun the country singer we suspect she is? Is Serpent an essential worker with pipes of gold? We’ve got our guesses, but we want to know what you think, too.