“Prisoner in a Test Tube!” – When Professor Anton Kraft is scheduled to travel to America to work with Jean Loring’s father, foreign agents replace him with one of their spies to learn American secrets. Suspecting this as a possibility, the CIA sends the Atom across the ocean to Hungary — home of Professor Kraft, to see if this is what truly happened.
Traveling to Kraft’s home, the Atom finds the spies about ready to take the real professor back to their home country. After a brief battle, the Atom trips himself up and gets caught on flypaper, making him a prisoner of the spies. However, they make the mistake of trapping Atom in a test tube not knowing that Atom could make himself small enough to escape the trap.
When the board the plane, the Atom springs into action knocking out the crooks and piloting the plane back to America, where the spy’s plans are exposed and are turned over to the authorities.

“The ‘Disappearing Act’ Robberies!” – When Jean’s friend Jim Barnes is accused of stealing a diamond ring from a jewelry store, it is just one of many strange robberies when it appears that the items stolen simply disappear.
Deciding to get involved as the Atom, Ray Palmer decides to hide out inside a chrome chess set, correctly predicting that they would be the next items stolen. When the chess pieces suddenly lift out of the area at super-speed and hidden high above, The Atom waits to see who retrieves the chess pieces, and it turns out to be reporter Greg Phillips.
Phillips had mastered the art of telekinesis, which he learned from a scientist just before the scientist died suddenly. Philips would keep the discovery to himself so that he could reap the profits. The Atom tracks Phillips to his next planned robbery of items from the local museum. The Atom springs into action and stops Phillips, turning him over to the police.
When Barnes is cleared of the crime, he then goes on to marry his sweetheart. At the wedding ceremony, Ray wonders when Jean will accept his proposals.