"Bad Boy" performed by 'chego 5' from Japan (they have youtube channel and IG)
Under the cut are the rest of groups/solo dancers featured in the episode, as well as who wins the chance to dance with Red Velvet!
"Power Up" performed by Sydney from Canada (ig: Sydneyy_shea)
"Peek-A-Boo" performed by a dance group from USA (struggled to find names for the group/members, sorry!)
"RBB" performed by a dance duo from Germany (their ig usernames: @mellinao and @emilie_kjs)
Canada and USA proceed to the next round. They both had to perform "Rookie".
In the end, the Winner is USA! The first video decides the winner, in the 2nd video the winners dance to "Red Flavor" with Red Velvet.
Main Source: All of the videos are from JTBC Entertainment channel found here
Individual sources: Bad Boy, Power Up, Peek-a-boo, RBB, Rookie 1, Rookie 2, Voting Results, Winning Performance