A New Threat...again is the second episode of the series Dragon Ball AF. It's original American release was February 5th, 2009 - the same date as of the pilot episode.
This episode starts out with Goku saying he's train the young Saiyans to become Super Saiyans. Master Roshi (who is still alive) has no idea what he’s talking about. Goku then tells everyone that there’s a place where he can get a years training in a day. Goku then teleports himself, Ryun and Seireitou. Vegeta Jr. says he can ascend to Super Saiyan but he wonders how. Goku tells Vegeta about the training place and Vegeta says he wants to go in first. Mr. Popo leads Goku, Ryun, Vegeta Jr. and Seireitou to the room where they will train. They get to it and Goku and Ryun go into the room. The room is about totally empty.
After they go inside, however, Vegeta senses a strong presence headed their way. The alien soon appears. Seireitou, unaware of the strength the alien possesses, attempts to show him off the lookout. The alien knocks Seireitou through the side of a pillar with his tail. The alien addresses Vegeta as a Saiyan Prince, and tells him that he is named Haifeiru.