A pair of drug dealers are murdered by Central City's newest vigilante, the Eradicator. Police forensic scientist, Barry Allen, calls on his beautiful neighbor, Fiona Webb, only to find her getting ready for a date, with Senator Creed Phillips. Webb leaves Allen to lock up. Allen's young neighbor, Troy Nathan, informs him that Allen's presence is required at police headquarters. En route to the police station, Allen, as the Flash, takes time out to thwart the "Spoilers", a local gang that preys on high school students. Unbeknownst to the Flash, the Golden Glider has drawn a bead on him.
Before she can fire her weapon, it is frozen solid by her brother, the notorious Captain Cold. Captain Cold convinces the Golden Glider that it is too soon to assault the Flash. In the police forensics laboratory, the Flash, as Allen, examines the remains of the Eradicator's victims. The molecular structure of their bodies has been broken down into a soapy solution, resembling bicarbonate of soda. Mick Rory, formerly the notorious criminal Heat Wave, awakes to find it snowing in his room, heralding the arrival of Captain Cold.
Captain Cold, along with the Golden Glider, assault Rory, chastising him for daring to go straight. Phillips establishes a strong anti-crime platform, to run on for his re-election. Phillips' hardline position against organized crime prompts Mr. Domino to order a hit on Phillips. Umbrage over Phillips' relationship with Webb automatically costs him Allen's vote. Allen joins police captain Darryl Frye, at his home, for dinner. While Frye's wife, Thelma, cleans up the dinner dishes, Frye escorts Allen into his private gym. There, Frye reveals his secret identity, that of masked vigilante, Captain Invincible.
Captain Invincible demands Allen attack him, to demonstrate his fighting prowess, After deflecting Allen's half hearted attack, Captain Invincible feints. Allen, at super-human speed, removes the Captain Invincible costume from Frye, redressing him in his civilian clothes, before Thelma can reach the bottom of the stairs. Phillips drops Webb off at her apartment. Frye confides in Allen that Allen is the only man who knows Frye's secret. En route home, Allen overhears a police broadcast, regarding the assault on Rory. Allen races to the crime scene, as the Flash.
The Flash removes the jewels from Rory's person, that were causing him to hallucinate that he was burning. Rory moves to get dressed, springing a death trap Captain Cold rigged in Rory's closet. The Flash saves Rory from certain death. As the Flash, somewhat, obsessively passes by his rival, Phillips' apartment buliding, he spies two men scaling the outer wall. The Flash knocks them loose from the wall, then enters Phillips' apartment to make sure there are no other thugs inside. Only Phillips' butler is on the premises. The Flash rescues the two thugs he sent plummeting to their doom.
A third assassin, however, is lurking on the roof. This man has the misfortune of encountering the Eradicator. As with all of the Eradicator's victims, the assassin comes to a grisly end.