Leatherhead and Mikey were a very sweet friendship. And Leatherhead's sacrifice is rather unexpected for a Nick show. Not sure what they'll do with him next. We can confirm he did lose the fight against General Traag, since the stone-man returned in the finale.
Very nice picture at any rate. Very sweet, bit melancholy and sombre and that reflects Leatherhead perfectly. And showing Mikey's rarely glimpsed serious side.