The first six undercover celebrity singers -- peacock, hippo, monster, unicorn, deer and lion -- face off against one another in elaborate head-to-toe costumes.

The second six undercover celebrity singers -- rabbit, alien, raven, pineapple, poodle and bee -- face off against one another while wearing elaborate head-to-toe costumes.

Peacock, monster, unicorn, deer and lion take the stage for their second performances; Joel McHale joins as a guest panelist.

Rabbit, alien, raven, poodle and bee each take the stage to perform a second time; Joel McHale joins as a guest panelist.

The first group of celebrity singers return to the stage to perform individually and as a group to keep themselves in the competition.

Keeping themselves masked, the remaining celebrity singers hit the stage to perform.

The remaining six celebrity singers merge into one big group as they perform anonymously; J.B. Smoove guest judges.

Two celebrities are unmasked, leaving only the top three singers; Kenan Thompson guest judges.

The three remaining finalists compete for the golden mask, and their identities are revealed; guest panelist Kenan Thompson.