The Nuclear Man

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 F.I.R.E.S.T.O.R.M.. 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.

Main Characters

 * 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

Villains

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

Teams and Organizations

 * Central City Picture News
 * The Flash's Team
 * S.T.A.R. Labs
 * CCPD
 * CC Jitters
 * CCFD
 * United States Army
 * CCFD
 * United States Army
 * United States Army
 * United States Army
 * United States Army
 * United States Army
 * United States Army
 * United States Army
 * United States Army
 * United States Army
 * United States Army
 * United States Army

Species

 * Metahumans
 * Humans
 * Dogs

Objects

 * The Flash Suit
 * Wheelchair
 * Firestorm Matrix
 * S.T.A.R. Labs Mobile Research Unit
 * Hologram
 * Reverse-Flash Suit
 * Reverse-Flash Ring
 * Cisco-ed Treadmill
 * Tachyon Prototype
 * Reverse-Flash Ring
 * Reverse-Flash Ring
 * Cisco-ed Treadmill
 * Tachyon Prototype
 * Reverse-Flash Ring

Locations

 * Earth-1
 * Earth
 * USA
 * Missouri
 * Central City
 * West House
 * CCPN Office
 * S.T.A.R. Labs Central City Facility
 * Time Vault
 * Brand and Paulson
 * CC Jitters
 * Central City Police Precinct
 * 52nd and Waid
 * Holly Drive
 * Allen House
 * 52nd and Waid
 * Holly Drive
 * Allen House
 * Holly Drive
 * Allen House

Trivia

 * The episode references the first issue of Firestorm in the comics.
 * This is the first episode where the transmutation form of Martin Stein and Ronnie Raymond is called as Firestorm instead of the Burning Man.
 * In, it is stated that Martin Stein studied in Ivy University in 1975. However, Martin Stein states that he and Quentin Quale are classmates in the University of Chicago in 1974. Either this is a continuity error, or Martin Stein was transferred between 1974 and 1975.