Rigby doesn't have his cutie mark yet, and neither do the three fillies in his new class. After learning about this, he is able to join the cutie mark crusaders, and become one of their new friends. But years pass. Apple Bloom gets hers, as does Sweetie Belle, and finally Scootaloo. Nothing Rigby has tried works. They're in their first year of high school, and he still has a blank flank. The stallion gets changed from so much failure, and his three friends try to cheer him up and help him out.