A mouse, trapped by a cat, writes a desperate plea for help to Atom Ant, who shows the cat that ants are not insignificant little creatures to step on. Just as Atom Ant thinks his work is done, he must save the cat from the dog next door.
With no trouble in the world today, Atom Ant goes back to the days of old where the evil black knight will take over the until now happy kingdom, unless someone is foolish enough to joust with him.
A kooky professor sneaks into the natural history museum to inject a prehistoric pteraducktyl with his new "Bring 'Em Back To Life" juice. Instead of obeying him, the bird flies the coop and terrorizes the metropolis.
Checking his world wide scanner scope for possible trouble spots, Atom Ant picks up his favorite call, "Help!" from New York, where King Konk is once again on the rampage.
Reading his earthquake seismograph, Atom Ant races to the Bavarian Alps to save a village from an avalanche of one prehistoric roc egg. Her feathers ruffled, the mother roc runs amok, terrorizing the village.