"The Pluto Syndrome!"

Traveling across the skyline of Gnu York City, Captain Carrot proves his worth as a hero to Superman when he stops an airplane from crashing after its pilots are hit by the "devolution ray." The two then head for the space barrier from which the rays seem to be coming, but upon reaching it Superman suddenly disappears, transported away. Cap is unable to burst through the space barrier under his own power and falls to earth.

The falling Captain Carrot is, coincidentally enough, caught by Piggsburgh's Pig-Iron, a super-strong and invulnerable hero who tells Cap how he gained his own powers from one of the fragments of the strange meteor which gave Cap his powers. Captain Carrot and Pig-Iron travel to Mew Orleans, which is in full celebration during the Mardi Gras Festival, to find another new, magical superhero named Alley-Kat Abra. The devolution ray strikes there as well, forcing the three into action to stop the affected Mew Orleans citizens from hurting each other. After Cap and Pig-Iron hear Abra's origin, all three travel to Kornsas, where they meet up with a fourth superhero named Fastback, a super-speedster who also reveals his origin story. The group of four then go immediately to Follywood, Califurnia, where the devolution ray is causing havoc on the L.A. freakway system, and meet its new native super-heroes, the super-stretchable Rubberduck and the magnetically-powered Yankee Poodle, who reveal their own origins after the six new heroes prevent numerous car accidents on the freakway.

The group of six team up and return to the space barrier, where, like Superman earlier, they are all transported to the planet Pluto. Upon that distant planet they discover a building in which Superman is being held captive under the influence of Kryptonite by an old JLA foe named Starro the Conqueror. After each trying to subdue the villain on their own, and failing, they listen to Captain Carrot's suggestion to use teamwork and are finally able to defeat Starro and release Superman. At the conclusion of this adventure they decide to remain as a team, given the name "Zoo Crew" by Superman.

Meanwhile, U.S. President Mallard Fillmore receives an ultimatum from a criminal organization known only as A.C.R.O.S.T.I.C. but is unaware that he is being watched by the head of that group.