Barry Allen, a police forensic scientist is working one night during a terrible thunder storm all alone. Suddenly, a bolt of lightning crashes through the lab window, electrocuting Barry and dousing him in chemicals. Barry survives the accident, and soon learns that he is now able to move at almost incomprehensible speed.
Meanwhile Nicholas Pike, an ex-cop turned gang leader, is seeking revenge against Barry's brother Jay. With the help of Tina McGee, a scientist who works with the ultra-advanced Star Labs, Barry constructs a suit that will withstand his super speed and also conceal his identity so that Pike's men won't retaliate against his loved ones.
Now Barry must find a way to stop Pike before it is too late.
As the search for Sally continues, Hunter becomes convinced that Sgt. Molinas plans to murder her. McCall goes undercover as a singer to bring down the drug ring.