Prince Rutherford

Prince Rutherford is a male yak and the prince of the kingdom of Yakyakistan. He first appears in the season five episode Party Pooped.

In When the Cold Breeze Blows Away, even though he and his yak army have been framed for damaging the St. Albert Elementary School of Silbervia and killing many students and faculty members, they would join the Grand Alliance and Equestria.