Mnet's "M! Countdown" is back with another spectacular episode chock-full of exciting performances, this time celebrating with their 300th episode!

Aside from the usual stages on tonight's episode, B2ST and BoA held their long-awaited comeback stages while D-Unit made their debut. Don't forget to check out Juniel and Super Junior's special stages from today!

Competing for the #1 spot, it was a hot battle between BoA, B2ST, and Psy, but in the end, it was B2ST who clinched the win tonight with "Beautiful Night"!

Congratulations to B2ST for their 'M! Countdown' trophy!



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Performers tonight included Wooyoung, Rhythm Power, Shin Yong Jae, Muzie, SISTAR, Jang Jae In, A Pink, B.A.P, A-JAX, Park Moo Jin, and Juniel

Check out the performances below:

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< A Pink >



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< Jang Jae In >



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< Wooyoung >



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< A-JAX >



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< Juniel >



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< SISTAR >



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< B.A.P >



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