The first eight groups perform and two are eliminated. Performers include University of Rochester YellowJackets, the Cat's Pajamas, Afro-Blue, Delilah, Fannin Family, Kinfolk 9, Urban Method, and Vocal Point.
The second of eight groups compete. The groups include Messiah's Men, North Shore, Pentatonix, Sonos, Soul'd Out, The Collective, University of Delaware Deltones, and Dartmouth Aires.
"The Sing-Off Holiday Special" will be filled with holiday and inspirational songs performed by the winning groups from all three seasons, a compilation of lead singers from season three, a collegiate ensemble and special guests.