The Flash season 4: Ranking its 10 best moments so far

3. The final battle with the Earth-Xers

The “Crisis on Earth-X” crossover came to an end when Team Flash, Team Arrow, Team Supergirl and the Legends all united to take down the Earth-X invaders. After losing Professor Stein, the heroes were more motivated than ever, and dedicated the final battle to his memory. With that in mind, they headed out to confront their enemies.

Not only was the triumphant music awe-inspiring, but seeing the heroes of all four shows marching through that fog together was enough to you goosebumps. As Supergirl and Firestorm aided from above, Killer Frost froze herself a path of ice to the battle. And the biggest lineup of superheroes in TV history was complete.

What followed was an all-out war between the heroes and the Nazis. Much of the epic fight stuck to Arrow‘s recent strategy of taking place all in one shot — which definitely added a more main-event feel to the battle. As the Legends took out a horde of Nazi soldiers, Green Arrow battled the Dark Arrow atop a police vehicle and Supergirl fought Overgirl in the skies. But all of the action slowed down from time to time to allow us to catch a glimpse of the fight between The Flash and the Reverse-Flash.

After a long, dramatic, edge-of-seat adventure, this epic battle was a fitting conclusion to the amazing Arrowverse crossover.