Madam Doom returns from Europe to New York City, and in a luxury hotel suite is selling a set of coastal defense plans, which turn out to be fake, a decoy! At espionage HQ, Black Ace's boss, who now has the real set of plans, assigns Ace to convey them to California, plus to pick up three espionage agents from three different cities along the way. They have 24 hours, and they know that Madame Doom knows that the plans are on their way.; In one week, four submarines, two of them American, are mysteriously lost at sea. An FBI agent, Amos Dobbs, shows up at Hugh Hazzard’s very upscale apartment building, and tells Hugh about his investigation into the world-wide submarine sabotage ring. The problem is that the Navy’s newest and most modern submarine is set to be launched the next day, at noon, and Dobbs is certain that the bad guys have it targeted. So Dobbs wants to get Admiral Hull at Annapolis to recruit that submarine's crew from there, and Hull goes along with that plan.; "The Avenger" is still at large, and is now threatening twelve wealthy friends of his original target, Mr. Carter, the air magnate. Carter calls on John Law for help and Amos Reid reveals to him that the assembled tycoons all owe their fortunes to an idea that they'd lifted from Jim Rowan. Reid is murdered, and his son George is framed for the crime. Law acts as young Reid's DA, but he is convicted and sentenced to die. On the eve of Reid's execution, Law figures out the elaborate death trap that killed Amos Reid, and if he can show this to the governor, the execution can be stayed!; At a hidden base in an extinct volcano in Alaska, "His Excellency" is using an ultra-sonic engine-stalling antiaircraft weapon to steal U.S. Army bombers, and using drugs to recruit the bomber crews to his service. Wings Wendall is sent to investigate, finds the villain's secret base, disrupts his plans, and causes him to flee in a stolen bomber. Wendall uses the villain's own ray weapon to crash the fleeing plane into the villain's own arsenal.; In Florida, Kent Thurston’s wealthy friend John Blaine is being squeezed for money by “The Green Lizard,” and two of his rich businessmen friends have already disappeared. Unbeknownst to Blaine, his servant Winters is secretly working for the extortion gang (as “Number Four”), and alerts them to Thurston’s involvement on the case. Meanwhile, in another room, Blaine’s two missing friends are still alive, but now the Lizard has decided to throw them to the crocodiles. When the Invisible Hood steps into the room, the Lizard sets a 10-minute timer on a hideout-destroying bomb, and flees.; Clip is tricked into breaking training rules so he'll be suspended before the big game. And while he's out of his room, the play book is stolen.; A gang of anarchists are setting off bombs in London, so Captain Cook and Inspector Keene decide to infiltrate the gang. Posing as "Number Twelve", Cook is assigned to blow up the bridge over the North River. He sets up a dud bomb, which gets him in trouble with the anarchist gang, who then try to throw him into a quicklime pit. He and Inspector Keene outsmart the gang and subdue them with teargas.; Sir John Lansing wants to bring the Shamar Ruby back to England with him, but others don't want that to happen.; Chic is chasing pirates in Singapore.; Wurtberg invades Cerania, so Flash Fulton and Andy are sent to Europe to get the story and get first hand pictures of the invasion. Taking many crazy chances, Fulton gets damning evidence of Rudolph being both an imposter and a war criminal.