Original: Often, Sylvester and Junior's shorts would feature Sylvester trying to capture Hippety Hopper, a baby kangaroo, to prove a point to his son.
Simplified: Sylvester Junoir is useually seen with Sylvester in the cartoons when Sylvester is trying to catch a baby kangaroo named Hippety Hopper who he often mistakes for a mouse to prove a point to his son.