A former prison guard, Sefra, has got hold of a supply of cesium 138, which explodes at temperatures above 70 degrees. Sefra plans to sell the sample and the formula from the closed-down prison base where he once worked. Rollin and Barney go in as a photographer and model respectively, and Sefra ""learns"" that Barney is a former prisoner returning for revenge. The team fakes a generator break down while Sefra beats Barney, and the cesium starts to heat up. Sefra has it taken to a nearby hospital refrigerator, where the IMF makes the switch. When Sefra discovers the missing jar, he forces Barney to show him the escape route which he supposedly used to escape. As Sefra makes his own escape, the IMF send the cesium sample toward him on a remote-controlled mini-tank, and it blows up, killing Sefra and making sure no one gets the formula or the sample.

Enemy operative Kiri has kidnapped U.S. envoy Carl Wilson and has an imposter, Gort, who is impersonating him to discredit a U.S. trade agreement. The team have to rescue Wilson and foil the impersonation before Kiri kills Wilson. Cinnamon impersonates Wilson's niece while Willy kidnaps Gort and Briggs-as-Wilson takes Gort's place, pretending to be Gort. The team put Gort in an asylum and give him electro-shock to scramble his memories, then claim he is is a delusional accountant. Under the threat of more electro-shock, Gort tells them the full details of his delusion: that he's to kill an American official and leave Wilson to take the blame. Barney and Willy replace the unconscious Wilson at the reception with a drugged Gort set to look like a suicide, then Briggs-as-Gort-as-Wilson takes a shot at the official. Briggs returns and reveals that "Wilson" is actually Gort, who was in Keri's employ.

An American intelligence officer, Hughes, has defected to the enemy with the only copy of an encoded top-secret message. The IMF must get to him, get him out, discredit him, and recover the message before the enemy can get a cryptographer, Belson, to work on the message. Rollin takes Belson's place, and sets it up so that Ambassador Brazneck, in charge of Hughes, believes that Dan is going to buy the papers from someone in the embassy. Rollin-as-Belson works with Hughes to decode the message, then drugs him. Willy gets special agent Tina Mera, a contortionist and acrobat, into the embassy through a fake air duct. She uses a fake bed covering to make Hughes ""disappear"", then break into the vault and get the real message. With Hughes out, Briggs picks up the fake message from someone pretending to be Hughes, who has ""disappeared"" from the embassy. Tina returns, plants money on Hughes, and removes the fake disappearing bed cover. Brazneck believes Hughes has betrayed him and Hughes flees

Alex Cresnic and his partner Walters have bought out an entire nation's heroin crop and are smuggling it into Marseilles for a sale - the IMF needs to put them out of business. Barney and Jim fake an elevator crash and ""blind"" Walters. In the hospital, Rollins impersonates Cresnic's voice and gives Walters specific instructions. Meanwhile, Cresnic believes Walters to be dead and meets Walters' widow, played by Cinnamon. She blackmails Cresnic into taking her on as his new partner, and then leads him to a rival competitor, played by Rollin. Jim is the chemist in the set-up, and Cresnic ""kills"" Willy and takes Jim to work for him. Jim has a jacket that lets him switch Cresnic's heroin for powdered milk. Cresnic makes the sale but the IMF has put an opening in the bottom of his desk where he stores the money. Rollin breaks in and tells the buyers to check their merchandise, after setting up Walters to go to the basement and check the money. The buyers discover the heroin is fake, and they

In the country of Elkabar, King Ibn Borca is conducting a brisk slave business with the aid of supplier Karl de Groot. de Groot raids into neighboring countries. The IMF team must put the two men out of business. Barney lets himself be captured by de Groot, gets the info on a cell, then escapes with the info so they can create an exact duplicate of the cell. Jim "sells" Cinnamon to de Groot, then Willy retrieves her and captures de Groot. Jim then approaches de Groot's partner Jara and tells him he killed de Groot and that Jara has a new partner...

Willy kidnaps Princess Amara, wife of the king's brother Fasar, who knows nothing of his brother's slave racket. They put Amara in the duplicate cell and then Rollin-as-Borca tells her she will be sold at the next auction. Jim delivers Cinnamon to Borca, and then they dress up a sedated Amara as Cinnamon, and Barney and Willy switch her for Cinnamon. Rollin, masquerading as an Interpol agent, convinces Fasar to go to a slave auction that Borca is holding. Disguised, the men watch as "Cinnamon" is put up for auction. Fasar reveals himself and Amara's disguise is revealed. She tells her husband of the slave cells. Borca is killed and Fasar puts an end to slavery in Elkabar.

Nicholai Kurzon, despite being exiled from his home country of Veyska by a military junta, leads a popular rebellion. He has been captured by the country's head of security, Colonel Stahl, and has a microfilm that contains the leaders of the revolution. The IMF must rescue Kurzon. Cinnamon gets closer to Deputy Chancellor Grigov by pretending to be an astrologer who predicts danger for the Chancellor. Thanks to Rollin's impersonation the ruse succeeds. Barney and Rollin sneak onto the plane Stahl is using to fly Kurzon back to Veyska. Rollin cracks the safe holding the microfilm and replaces it with a fake listing implicating Grigov. Meanwhile, Cinnamon has used her predictions to turn Grigov and Stahl against each other. When Stahl consults the fake list, he arrests Grigov and his assistant, leaving Kurzon unprotected. The team grabs Kurzon and replaces him with an automated dummy, then fake an accident and ""Kurzon"" is blown out the airplane. When the plane lands Jim spirits Cinnamon

David Redding is a photographer and a spy working for the other side, who has supervised the infiltration of 150 agents into the U.S. The agents are apparently carrying some kind of biological plague, and only Redding knows the code. The IMF must get it from him. To do so, they set up Cinnamon as a former fashion model and scientist married to Jim who is working with a bacillus-suspension formula. This gives Redding a reason to accept the assignment - he tortures ""Jim"" who claims the U.S. is planning a nuclear strike. Redding and his assistant Morley plan to take refuge in Redding's bomb shelter and command center after sending a signal to his country (which is blocked by Barney), but Rollin and Willy arrest them. When the IMF fakes a nuclear attack Redding leads the others to the shelter, then ""kills"" Willy. He tries to send more coded messages (again, blocked by Barney), and Rollin witnesses Redding coding them. At the end he leaves as it is revealed that the IMF switched Redding and

Raymond Halder is the owner of a chain of clinics and runs a drug counterfeiting ring. Gant Pharamaceuticals released a drug that helps against primary vascular disease, but the drug is being withdrawn since Halder flooded the market with potentially fatal counterfeits. Gant plans to resissue the drug and the IMF must stop Halder from counterfeiting the new version. The IMF as Federal agents put pressure on Halder, but he escapes. Cinnamon pretends to be a Gant employee in charge of protecting against counterfeits. Gang bribes Rollin the Federal Agent to frame Cinnamon to force her to give him Gant's anticounterfeiting strategy. However, the team use an ultarsonic laser to make Halder think he is suffering from primary vascular disease, and he ends up at one of his own clinics where Barney-as-a-doctor prescribes one of Gant's counterfeits. Terrified for his life, Halder confesses so that he won't get a dose of his own medicine.

Burt Gordon has set up a new version of Murder, Inc. for the Synidcate. The IMF need to get evidence of his actions. Jim and Cinnamon become Gordon's new neighbors, and their brother Rollin claims they are being haunted by the ghost of their long-dead sibling. Cinnamon seduces Gordon and wants him to kill her husband. A provoked Jim then attacks Gordon and is ""killed"" by Gordon's hitman, Connie and fake-disposed of in an incinerator. But then Jim's ghost comes back to haunt Gordon, ""killing"" Cinnamon. Gordon follows Jim's ghost-voice to his body and shoots it again...only to find out that the IMF disguised Connie as Jim. The police arrive and arrest Gordon for murder.

Milos Kuro, minister of culture has been using propaganda to discredit his premier, Leon Vados. Vados is a progressive trying to negotiate a nonagression pact with the U.S. When in the U.S. Kuro witnesses a play written by Cinnamon that undermines Vados and the U.S. He arranges to have it staged in his country. But Cinnamon and Rollin leak the play's existence to Vados. Vados attends a rehersal and is seated beneath a special radar disk that creates a sound envelope so that Vados hears only the special dialogue the IMF has created that makes Vados out to look like a fool. Vados has Kuro arrested.