Mamma Mia - it's ABBA night on The Masked Singer! This week's episode is full of pop rock and disco nostalgia, as the reigning champ takes on two new celebrity singers, each performing iconic songs - including "Dancing Queen," "Fernando" and S.O.S." - from the one and only Swedish supergroup, ABBA.

The Masked Singer celebrates the Big Apple! This week's episode embraces both the glam and the grit of the city that never sleeps, as two new contestants take on the reigning champ from last week and sing a collection of songs synonymous with the history of New York.

Three new singers enter the game on DC Superheroes night. While the audience and panelists celebrate their favorite iconic DC Superheroes in costume, celebrities vie for their chance at the champion of The Masked Singer in three brand-new costumes!

Elmo, Big Bird, Cookie Monster, Oscar the Grouch, The Count and Abby Cadabby bring the fun in a special Sesame Street episode.

Grab the cowboy boots and cowboy hats because The Masked Singer has gone country! Three celebrities will perform their favorite country songs, two will be unmasked, but only one singer will advance straight to the quarterfinals with California Roll.

The Masked Singer goes retro with a trip back to the 80s! A brand-new group of singers belt out hit favorites from the neon decade, but only one will move forward in the competition as the other two unmask!

Get your popcorn and settle in as The Masked Singer celebrates the cinema! The costumed celebrities perform iconic songs from hit Warner Bros. films from their 100 years of movie magic.

Houston, we have a problem! The Masked Singer is even more out-of-this-world than usual in a special "outer space" themed episode.

In this special episode of The Masked Singer, the road to the finals is underway as we recap the journeys of the three remaining champions and the three remaining underdogs, while also looking back on the season and who has been eliminated thus far.

The three "Saved by the Bell" singers - Mantis, Gargoyle and Medusa - compete for their spot in the quarter finals! All three were saved by the new "Ding Dong, Keep It On!" bell, but now two will be unmasked and only one will go on to be named the Group Champion.

It's the Quarter Finals on The Masked Singer, and the British are coming! Watch the final four compete for a spot in the coveted Semi-Finals, performing hit songs from artists across the pond. Only one will be unmasked!

The remaining three celebrity singers perform, but only two move on to compete in the season finale.

The final two contestants each perform two songs; one celebrity is crowned the Season 9 winner.