Captain America, Goliath, Hercules, Quicksilver and Scarlet Witch are relaxing in Avengers Mansion, although Cap is still brooding about giving up his costumed identity (which he will do briefly in Tales of Suspense #95-96), and about his new love for SHIELD Agent Thirteen. Hawkeye arrives with the fully recovered Natasha, who is still determined not to return to activity as Black Widow (she was hospitalised in #44, and decided to hang up her costume last issue). Then newly-rich Wasp enters with her new chauffeur Charles. As well as already being out as the Wasp, Jan is blase about using Hank and Pietro's names in front of the civilian.
Herc and Wanda join Hawkeye and Natasha for a stroll and Steve and Pietro go to a ball game, leaving Hank and Jan working in Goliath's lab in the Mansion. Hank reasons that his Goliath power isn't as much use to the Avengers now that they have Hercules, so he plans to concentrate more on the Ant-Man side of things. He has renewed his experiments with ants, and
Jan joins him in her Wasp costume because they may want to shrink.
Jan has dismissed Charles for the day. But when he gets home we discover that he is really Dave Cannon, Giant-Man and Wasp's old foe Human Top with a new costume and a new name Whirlwind. He's out of jail (after a typically short Marvel sentence) and out for revenge. After becoming Jan's chauffeur to spy on Avengers' security, he decides their security devices are too good for him to fool, and just smashes his way in through a wall or two.
Making a lucky guess Whirlwind activates a reducing ray which shrinks Goliath and Wasp to ant-size, and he drops them in Hank's experimental ant farm. Because they were shrunk by ray rather than by mental command they can't grow of their own accord, they haven't retained the strength of full-sized humans, and Wasp doesn't have her wings. By ill luck Wasp is wearing her old costume, and has left her stings in the new costume she had last issue. On top of that they're in a colony of red ants, and they've only worked with black ants before. Which may be irrelevant because their modern costumes don't include ant-controlling cybernetic helmets.
To add urgency to their plight they see Whirlwind though the glass side of the ant farm planting a time bomb.
Armed only with a stiff piece of wire the partners fight their way towards a cybernetic control centre Hank built in to the farm. On the way Wasp kills a larger ant who is the queen, and the other ants stop fighting. Hank fashions a cybernetic helmet from bits of the control centre, and the duo ride ants to the top of the ant hill, and Hank clambers out of the ant farm.
Meanwhile Cap and Quicksilver have returned early because the ball game was rained off (though it doesn't seem to have affected the other couples' stroll). Spotting the hole in the wall they attack Whirlwind. After a brief fight the villain is poised to escape the imminently-exploding bomb when Hank reaches an amplifier and warns his comrades about it. Pietro rushes the bomb to the East River. (On the way back he hears anti-mutant comments about him and Wanda.)
Whirlwind makes good his escape. Cap uses the reverse setting on the reducing ray to bring Hank and Jan to full size. But Wasp feels it has had some effect on her powers (I don't think anything ever comes of this). And Hank plans to include a cybernetic helmet in his costume from now on, and function as Ant-Man as well as Goliath.