Fast Enough

Synopsis
Wells presents Barry with a life-changing choice. Dr. Martin Stein and Ronnie Raymond return to help the S.T.A.R. Labs team with this final fight.

Main Characters

 * The Flash's Team
 * The Flash (Barry Allen)
 * Martin Stein
 * Ronnie Raymond
 * Caitlin Snow
 * Joe West
 * Cisco Ramon
 * Iris West
 * Eddie Thawne
 * Nora Allen
 * Henry Allen
 * Kendra Saunders
 * David Singh

Villains

 * Harrison Wells/Reverse-Flash (Eobard Thawne)
 * Killer Frost (Caitlin Snow)
 * Unnamed Robot

Other Characters

 * Katie Rogers
 * Martin Stein's Father
 * Rip Hunter's Team
 * White Canary (Sara Lance)
 * Captain Cold (Leonard Snart)
 * The Atom (Ray Palmer)
 * Rip Hunter
 * Nora Allen's Father

Teams and Organizations

 * The Flash's Team
 * S.T.A.R. Labs
 * Big Belly Burger
 * CCPD
 * IHP
 * CC Jitters
 * IKEA
 * CCPN
 * Mama Chow's Fine Dining
 * MIT
 * Flash Museum

Species

 * Metahumans
 * Humans
 * Cows
 * Robots
 * Thanagarian-Human Hybrids

Objects

 * The Flash Suits
 * Reverse-Flash Suit
 * Dark Matter
 * Cisco-ed Treadmill
 * Wormhole
 * Girder
 * Wheelchair
 * Time Sphere
 * Reverse-Flash Ring
 * Vibes
 * Breaches
 * Tachyons
 * White Canary Suit
 * Cold Gun
 * A.T.O.M. Exosuit
 * Captain Cold Suit
 * Captain Cold Goggles
 * Jay Garrick's Helmet

Locations

 * Earth-1
 * Earth
 * United States of America
 * Missouri
 * Central City
 * S.T.A.R. Labs Central City Facility
 * Particle Accelerator
 * Big Belly Burger
 * Allen House
 * Central City Police Precinct
 * CC Jitters
 * CCPN Office
 * Mama Chow's Fine Dining
 * Flash Museum
 * Keystone City
 * IHP
 * Massachusetts Institute of Technology
 * Speed Force
 * Earth-2
 * Earth
 * United States of America
 * Central City

Trivia

 * The visions in the Speed Force predicted future events in the series.
 * The Flash Museum is later introduced in Season 5 as a different design.
 * Barry's imprisonment in Iron Heights Prison is later shown in to.
 * The vision of Killer Frost is later shown as the one of Earth-2.
 * The vision of Sara, Ray, Snart and Barry fighting a giant robot was later revealed as test footage for and was used as the series' first look trailer.