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

Antagonists

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

Other Characters

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

Teams and Organizations

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

Events

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

Species

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

Objects and Concepts

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

Locations

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