Its been 17 years since the turtles mutated, Splinter.. Splinter wasn’t alive to congratulate them anymore. Mikey had made a cake but even he wasn’t feeling it, it didn’t seem right celebrating without Splinter. Donnie was heartlessly picking at his slice of the cake, Leo was staring at nothing in particular, brooding, Raph just looked down, and Mikey was doing his best to look cheerful but it wasn’t really working