Mnet's 'M! Countdown' is back for its weekly show featuring performances by your favorite artists!

On this week's episode, NMIXX debuted with "O.O", TEMPEST made their debut with "Bad News", CLASS:y debuted with "Surprise", Super Junior made a comeback with "Callin'", Cherry Bullet came back with "Love in Space", Rocket Punch returned "Chiquita", and Song Ha Yea came back with "Winter Rain".

As for the winners, STAYC and BTOB were the nominees, but it was BTOB who took the win with "The Song". Congratulations to BTOB!

Other performers included Kim Min Jong, BTOB, STAYC, Wonho, CRAXY, Trendz, JWiiver, and Han Seung Yun.

Watch the performances below!

WINNER:

===

DEBUT: NMIXX

==

DEBUT: TEMPEST

==

DEBUT: CLASS:y

==

COMEBACK: Super Junior

==

COMEBACK: Cherry Bullet

==

COMEBACK: Rocket Punch

==

COMEBACK: Song Ha Yea

==

Kim Min Jong

==

BTOB

==

STAYC

==

Wonho

==

CRAXY

==

Trendz

==

JWiiver

==

Han Seung Yun

===