User blog comment:DoodleFox/It's All About Us/@comment-1414871-20141022124827/@comment-24919513-20141022132224

It's not a crossover.

It's showing off Mabel, Dipper, Stan, Wendy, Soos, Robbie, Gideon, Old Man McGucket, Stan's rumored twin, Pacifica, and Bill Cipher.