Story
Featuring
Challengers of the Unknown
"We've got to stop Zammer!"
Storyline
After hearing a television report about a burglar with the ability to walk through walls, the Challengers patrol the city with honorary member June Robbins accompanying them. They arrive too late to stop another robbery but pursue the thief, Anton Zammer, to his hideout, an abandoned laboratory owned by the late Prof. Macon, who left behind a number of inventions Zammer intends to use for his own gain. Zammer uses a shrinking ray to capture and cage the Challs, but June escapes the same fate, assisting the team in returning to their normal size and capturing Zammer.