Their relationship has to be one of my favorites in the series. Wally and Abby’s chemistry is so genuine and natural that one would think they were brother and sister. Abby acts like the responsible cool older sister while Wally acts like the dorky little brother most of the time but they balance each other out. My favorite episode with the two of them together is obviously Operation: D.O.G.H.O.U.S.E where we see how close they really are. Abby’s moment of weakness and Wally’s understanding and supportiveness shows the kind of sincere bond they have. Plus they are both the best fighters in their team and are shown throughout the series that they have the best teamwork when they go on missions together.