"Crisis on Earth-C-Minus!" from Captain Carrot and His Amazing Zoo Crew #15 (DC, 1983) by Scott Shaw! and E. Nelson Bridwell
A series I picked up only occasionally, but that I like a lot more now than I did as a "too cool for funny animals" teenager, Captain Carrot was filled to the brim with puns, fun art and silly concepts. The most mind-boggling thing, which I found out in the letters' page probably is that Pig-Iron's secret identity if Peter Porkchops, who had his own funny animals series in the 50s! It's all connected, kids, and every piece matters.