The trainees film themselves individually performing "_?? (X1-MA)" as their fellow grade members watch. Each video is watched by the mentors, who then reevaluate the trainees. After the re-evaluation, they are given their new grade and asked to move to their new rooms corresponding to their rank. Following the reorganization, they are told that instead of voting for the center position amongst themselves, the national producers voted. DSP Media's Son Dongpyo, Brand New Music's Kim Sihun and Top Media's Kim Wooseok are shown to be the Top 3, with Son Dongpyo ultimately winning the coveted center position. Not long after, they then film the "_?? (X1-MA)" music video. The trainees begin their second mission: Group X Battle. Unlike the previous season where trainees competed against each other with the same song, the songs they are competing with are a group's debut song versus a hit song. The teams are: EXO's "MAMA" vs. "Love Shot", BTS's "No More Dream" vs. "Blood Sweat & Tears", Monsta X's " Trespass" vs. " Dramarama", Seventeen's "Adore U" vs. "Clap", NU'EST W's "Dejavu" vs. "Where U At", Wanna One's "Energetic" vs. "Light", NCT U's "The 7th Sense" vs. "Boss", and GOT7's "Girls, Girls Girls" vs. "Lullaby". All songs are performed live and each member is voted on by the audience individually. The group with the highest score among the two wins and gains a benefit of 3000 bonus votes for each of its members, with the highest ranked member will gain an extra benefit of having his score multiplied by 10 in addition of the 3000 bonus votes. The group with the highest votes will later perform on M! Countdown. Rehearsals and performances of "MAMA," "Love Shot," and "No More Dream" are shown this week. The episode ends with the current rankings, with OUI Entertainment's Kim Yohan maintaining his 1st place position. (Source: Wikipedia)