15 surprising things you didn't know about 'The Masked Singer'

The Monster contestant and host Nick Cannon on an episode of "The Masked Singer."Michael Becker / FOX

• Fox's "The Masked Singer" is a popular singing competition where the singers have secret identities and they perform while wearing costumes.
• The series is based on a South Korean game show.
• Even the contestants' entourages must go undercover when they're on set.

Fox's "The Masked Singer" is a singing-competition show that has celebrities conducting over-the-top musical performances complete with back-up dancers, choreography, and special lighting each week.

The catch is that the competitors are dressed in elaborate costumes that hide their true identities, which will only be revealed when they are eliminated from the competition and are unmasked.

Ahead of the show's fourth season, read on for 15 things you probably didn't know about "The Masked Singer."