Space.13: Stinger's Challenge To His Brother! (スティンガー、兄への挑戦！ Sutingā, Ani e no Chōsen) is the thirteenth episode of Uchu Sentai Kyuranger. This episode features the departure of Kotaro Sakuma to the Rebellion HQ for training but he will later return 7 episodes later, as well as of Stinger and Champ for independent operations.