It's a Mad, Mad, Mad, Mad Scientist

Synopsis
After Sara, Ava, Behrad and Gary arrive in New York City, they track down Dr. Gwyn Davies, who isn't the scientist they expected. Astra, Spooner, and Gideon are still trying to stop the Legends from using the time machine, but they run into some more setbacks along the way. Meanwhile, in the pocket dimension Nate and Zari work together on the Hoover situation as well how to make their future together work.

Protagonists

 * Legends of Tomorrow
 * Gary Green
 * Sara Lance
 * Ava Sharpe
 * Behrad Tarazi
 * Nate Heywood
 * Zari Tomaz
 * Astra Logue
 * Gideon
 * Esperanza "Spooner" Cruz
 * Gwyn Davies
 * Erwin George "Cannon Ball" Baker

Villains

 * J. Edgar Hoover
 * Thomas Edison
 * Thomas Edison (Robot)

Other Characters

 * John Constantine
 * Mick Rory
 * Martin Stein
 * God
 * da Vinci
 * Rip Hunter
 * Ray Palmer
 * Dr. Parker
 * Alun Thomas

Teams and Organizations

 * Grand Central Station
 * Legends of Tomorrow
 * Dr. Zip Cola
 * Time
 * Liberty
 * LaLonde & Son
 * Edison Labs
 * Press Bulletin
 * Time Bureau
 * NASCAR
 * Bellevue Hospital
 * New Jersey State Police
 * Northcott Ltd Distillery

Events

 * Escape from 1925
 * Time Travel Experiment
 * World War I

Species

 * Humans
 * Necrians
 * Human-Kriblix Hybrid Clones
 * Clones
 * Robots
 * Metahumans
 * Demons

Objects

 * Image Inducers
 * Totems of Zambesi
 * Totem Wristbands
 * Air Totems
 * Magic
 * Lightning Spell
 * Timeships
 * Waverider
 * Rogue Waverider
 * Gwyn Davies' Time Machine
 * Time Aberrations
 * Time Machine: Engineering Challenges & Solutions
 * Time Couriers
 * Terminator
 * Portals

Locations

 * Earth-Prime
 * Earth
 * United States of America
 * New York
 * New York City
 * Grand Central Station
 * LaLonde & Son
 * Edison Labs
 * Romine Residences
 * Bellevue Hospital
 * Los Angeles
 * Ohio
 * Cleveland
 * Columbus
 * Canada
 * Tahiti
 * Time Bureau Safe House
 * Russia
 * Chernobyl
 * Hell
 * Phantom House
 * World Between Worlds