The Season Six contestants boast a combined 85 Grammy Nominations and 27 wins, three Academy Award nominations, 12 Emmy Nominations, 12 Razzie Award Nominations, two Super Bowl appearances and two Lifetime Achievement Awards.

On Night Two of the special two-night season premiere, Group A returns and is joined by TWO all-new Wildcard contestants for a competition unlike any other, as one more will be unmasked at the end of the night.

Meet the second group of celebrity singers, "Group B," in all-new jaw-dropping costumes and see WHO will be unmasked!

The "Group A" members return, and a new wildcard enters the game.

The characters from Group B return for their second performances of the season, and a new wildcard enters the game.

The Group A celebrities take the stage and another wildcard enters the game

A special countdown of the greatest performances in the show's history. Watch never-before-seen, behind-the-scenes footage of the unmasked singers from Season 6, while new hints and clues are dropped for those who have yet to be revealed.

The singers from "Group B" return to the stage in a special Thanksgiving-themed episode and the final wild card enters the competition. Joel McHale is back as a guest panelist to keep Ken in check.

The final four "Group A" singers will compete in the semifinals and two will be eliminated from the competition. Will.i.am brings his expertise to the panelists' desk and assists Ken Jeong, Jenny McCarthy, Nicole Scherzinger and Robin Thicke breaking down all the clues on America's favorite guessing game.

The final four "Group B" singers will compete in the semifinals and two will be eliminated from the competition.

The final two singers from "Group A" perform solo, and then with celebrity duet partners Jesse McCartney and Michael Bolton, before one is unmasked and sent home.

The final two singers from "Group B" perform solo, and then with celebrity duet partners and show panelists Nicole Scherzinger and Robin Thicke, before one is unmasked and sent home.

The final two singers -- the winner from group A and the winner from group B -- perform. [Part 1 of 2]

A Christmas extravaganza, with never-before-seen holiday performances from favorite contestants.