The Nuclear Man

"He's not even Ronnie anymore. He's Martin Stein walking around in Ronnie's body, like a vampire."

- Caitlin Snow

Synopsis
After Ronnie attacks a physicist, Barry and the team realize they need to go after Caitlin's fiancé who is now a dangerous meta-human. They deduce the best way to track Ronnie is to find Dr. Martin Stein, who was working on a project called FIRESTORM Barry struggles to balance his duties as The Flash and his relationship with Linda Park, and Joe enlists Cisco's help to reinvestigate the murder of Nora Allen. General Eiling returns to Central City.

Protagonists

 * The Flash's Team
 * The Flash (Barry Allen)
 * Joe West
 * Cisco Ramon
 * Caitlin Snow
 * Harrison Wells (Eobard Thawne)
 * Linda Park
 * Eddie Thawne
 * Firestorm (Ronnie Raymond)
 * Firestorm (Martin Stein)
 * Iris West
 * Clarissa Stein

Antagonists

 * Reverse-Flash/Harrison Wells (Eobard Thawne)
 * United States Army
 * Wade Eiling
 * Sergeant Bates

Other Characters

 * Quentin Quale
 * Quentin Quale's Brother
 * Nora Allen
 * Sherry
 * Sherry's Ex-Husband
 * Albert Einstein
 * Linda Park's Father
 * Linda Park's Mother
 * Mal Duncan
 * Henry Allen
 * Gideon

Teams and Organizations

 * Central City Picture News
 * Taco Restaurant
 * The Flash's Team
 * S.T.A.R. Labs
 * Brand and Paulson Convenience Store
 * CCPD
 * CC Jitters
 * 52nd and Waid Building
 * CCFD
 * Concordance Research
 * University of Chicago
 * Channel 52
 * Saved by The Flash
 * Central City-Starling City Train
 * FIRESTORM
 * Conway Prize for Scientific Advancement
 * Paper Clip
 * Big Belly Burger
 * United States Army
 * Rapid Respond Team

Events

 * Reverse-Flash's War
 * Rescue of Firestorm

Species

 * Metahumans
 * Humans
 * Dogs
 * Vampires
 * Artificial Intelligence

Objects and Concepts

 * The Flash Suit
 * Wheelchair
 * Wells: A Biography
 * Dark Matter
 * Firestorm Matrix
 * Firestorm Matrix Core
 * S.T.A.R. Labs Mobile Research Unit
 * Super Light (Multispectrum Ultraviolet Laser Enhanced Scanner)
 * Hologram
 * Reverse-Flash Suit
 * Reverse-Flash Ring
 * Cisco-ed Treadmill
 * Tachyon Prototype
 * Reverse-Flash Ring
 * Firestorm Suit
 * Quantum Splicer

Locations

 * Earth-1
 * Earth
 * United States of America
 * Missouri
 * Central City
 * West House
 * CCPN Office
 * Unnamed Taco Restaurant
 * S.T.A.R. Labs Central City Facility
 * S.T.A.R. Labs Particle Accelerator
 * Time Vault
 * Brand and Paulson
 * Convenience Store
 * CC Jitters
 * Central City Police Precinct
 * 52nd and Waid
 * Building
 * Concordance Research Lab
 * Holly Drive
 * Allen Residence
 * Carson Station
 * Stein Residence
 * Paper Clip
 * Big Belly Burger
 * Badlands
 * Chicago
 * University of Chicago
 * Pedmont State Park
 * Hudson Falls
 * Wade Eiling's Facility