Mnet's M! Countdown is back with another episode of great performances and musical treats. There were debuts for SISTAR 19 and SpinEL, while Kim Wan Sun and Untouchable made their comebacks. Elsewhere, CNBLUE begun their follow-up promotions while Girl's Day said goodbye. It was a battle between 4minute, Park Bom, and f(x) for the #1 spot on M! Countdown today, and in the end, it was f(x) who grabbed the win tonight. Unfortunately, the girls weren't performing tonight and couldn't receive their trophy in person. Congratulations to f(x) on their win! Songs that charted this week. Today's MCD had an alternative chart which had last week's performing artists hitting a hammer strength machine backstage. Guess who hammered their way to the highest score? Other performers who stood on stage included Eru, Rainbow, A Pink, U-Kiss, Soul Dive, Dal Shabet, December, Turtle, Brian, and Monday Kiz. Check out their performances below! ===