'The Voice' Super Bowl promo - behind the scenes with coaches: video
The four mentors appeared together in the promo - named Vocal Kombat - which saw them fighting to become the first to discover the origins of a mysterious, beautiful voice, which it is later discovered belongs to Betty White.
Discussing the concept of the promo, Aguilera said: "We're all in a hotel and at the same moment hear this amazing voice, the most beautiful sound we've ever heard.
"We all know at that moment that each one of us will go for that voice and we want to be the first one to get there. We're all racing, punching, kicking, throwing each other, Blake is lassoing me with a microphone."
Watch The Voice coaches making their Super Bowl promo below:
> Read Digital Spy's full The Voice headlines
Joking about their preparation for the commercial, Levine said: "We've been trained to fight. It was really intense. About a six-month super hardcore spy training regiment - and I'm a killing machine now.
"There is nothing left in [my head]. It's a hollow shell of no emotion. We kill at will... You should thank me for not killing you. You're still alive, you're welcome. That's kind of where I'm at right now and that's good because it's a really important commercial and we're prepared for it."
The Voice kicked off its second season immediately following the Super Bowl on NBC on Sunday (February 5).
It continues tonight (February 6) at 8/7c on NBC.
> The Voice season two premiere blind auditions in pictures
Watch the Voice Super Bowl promo below: