This has the Arrowverse years in their own playlists. I will only create a new year when the years reactions are done. 

Oliver Queen is a billionaire playboy who begins the series being saved from an Island where he was allegedly stranded for 5 years named Lian Yu. After returning to Star City he takes up the mantle that would eventually become the Green Arrow to take down the criminals that have failed this city with his team of vigilantes.

Barry Allen gets struck by lightning on the night the particle accelerator explodes which turns him into the speedster famously known as The Flash. He and his team at S.T.A.R. Labs take down other meta-humans and uncover the truth behind his mother's murder. 

John Constantine is a warlock that spends his life exorcising demons in an attempt to redeem his past decision that lead to a child being sent to hell. 

(Originally aired on the NBC - the character is re-introduced into the CW's Arrowverse).

Kara Danvers, the cousin to famous superhero Superman is forced to reveal herself  after her adoptive sister is put in danger, as she dawns a cape of her own becoming Supergirl in order to save National City from alien and non-alien threats.

(Season 1 aired on the CBS and changed networks to the CW).

Rip Hunter puts together a team of misfits and outcasts such as Sara Lance (White Canary), Ray Palmer (Atom), Mick Rory (Heatwave) and co. in order to fix timeline anomalies, some of which they create themselves.

Retired superhero Black Lightning is forced to return when one of his daughters is held hostage and comes to the realization that the city of Freeland needs his help to take down the criminal elements plaguing his city.

A six-episode mini-series broadcast online alongside Arrow. Felicity Smoak meets Roy Harper and has a special mission for him.

Vixen is based on the DC Character Mari McCabe / Vixen, a costumed superhero crime-fighter with the power to mimic the abilities of any animal that has ever lived on Earth.

Taking place on the alternate Earth, Earth-X, a world where the Nazis won World War II, Ray and his friends Black Condor, Red Tornado, and a handful of others fight against Nazi-aligned versions of popular Arrowverse Heroes including Green Arrow, Flash, and Supergirl, for the freedom of the world.

Cisco Ramon works late at night attempting to improve the Flash's suit to make it more bullet proof and odor resistant. An unexpected intruder threatens Cisco while he is working late one night at S.T.A.R. Labs.

Before we had Grant Gustin as Barry Allen, There was John Wesley Shipp. In this version of The Flash (1990) Barry Allen is a forensic scientist working for the Central City police, when struck by lightning and doused in chemicals in his lab. He develops super speed and creates a superhero identity for himself to fight crime: The Flash.

Three years after the disappearance of her cousin Bruce Wayne, Kate Kane takes on the mantle of Batwoman to protect the people of Gotham while Batman is gone.

High school student Courtney Whitmore inspires an unlikely group of young heroes to stop the villains of the past.

The world's most famous superhero and comic books' most famous journalist face the pressures and complexities that come with balancing work, justice and parenthood in today's society.

Naomi McDuffie is a comic book-loving teenager and the host of a Superman fan website. After a supernatural event occurs in Port Oswego, Oregon, Naomi sets out to determine its origins with help from her best friend, her supporting adoptive parents, and a tattoo shop owner with a secret origin.

When an efficiency-obsessed elf decides that Christmas would run better without Santa, Beebo and his friends travel to the North Pole to help discover what truly makes Chrismas meaningful.

In this two episode crossover Barry and Oliver work together on a case involving Captain Boomerang but get caught up in a second case with a meta-human that can control peoples emotions named Roy Bivolo. The two must come head to head when one of them is affected by the meta-human power and becomes enraged. 

In this crossover we're introduced to villain Vandal Savage as he tries to conquer. Team Arrow and Flash try to take him down with the help of new found superhero's Hawkgirl and Hawkman. This crossover sets up the TV show "DC's Legends Of Tomorrow". 

After the events of Flashpoint, an alien race called "Dominators" come to take over the world. In an attempt to fight back, The Flash manages to round up team Arrow, the Legends & an alien of their own named Supergirl in this 4 part crossover event.

Barry and Iris’s wedding brings the gang together, but things go awry when villains from Earth-X attack the ceremony. All of the superheroes band together with help from their super friends like Citizen Cold, The Ray, Felicity Smoak, Iris West and Alex Danvers to take on their most formidable villains yet. Earth's mightiest heroes - Green Arrow, Supergirl, The Flash and White Canary - lead their teams into battle to save the world in this 4 part crossover event.

After waking up in what seems each other's bodies, Barry and Oliver gather their teams together with the help of Supergirl and Superman to fix the problem. The teams travel to Gotham where they come across Batwoman who helps lead them to take down a man that that's been re-writing reality. A book given to him by the Monitor.

When the Anti-Monitor unleashes his wrath on the multiverse and begins to destroy various Earths, the world's greatest heroes must find a way to stop him.

A powerful alien threat arrives on Earth under mysterious circumstances and Barry, Iris and the rest of Team Flash are pushed to their limits in a desperate battle to save the world. But with time running out, and the fate of humanity at stake, Flash and his companions will also need to enlist the help of some old friends if the forces of good are to prevail.