Stephen Amell Thanks Fans, Reflects On Arrow's 100th Episode

Hours ago, before Arrow aired its hundredth episode on the East Coast (see our review here), series star Stephen Amell took to social media to thank fans for their support and to look back on the last five years playing Oliver Queen.

You can see the post below, embedded from Amell's official page, in which he praised the network, his castmates, and more, all of whom he said were essential in getting to this landmark episode.

"We also have the incredibly unique and - possibly - unprecedented opportunity to celebrate this episode alongside three other shows that have helped populate this television universe into something magical," Amell wrote. "A four night crossover! Aliens?!?! What a treat."

Arrow, The Flash, and Supergirl will cross over with DC's Legends of Tomorrow this week in "Invasion!" a three-part crossover that starts in the final moments of an episode of Supergirl and then plays through the other series. Based on the 1988 comic book event miniseries Invasion! from Keith Giffen, Bill Mantlo, Todd McFarlane, Bart Sears, and the crossover -- with its marketing title "Heroes vs. Aliens" -- will closely track the plot of that storyline: aliens will be assembled by The Dominators and descend on Earth to bring an end to the "threat" of Earth's burgeoning metahuman community.

In the comics, the Dominion were secretly hoping to build their own super-race, and as a result created a handful of new superheroes in the course of the story.

In the TV version, rather than assembling a loose alliance of dangerous alien races, the Dominators will apparently be mind-controlling the aliens that join them. That's a revelation that suggests even the heroes might be forced to take one another (or at least the alien Supergirl) on at some point in the story.

NEXT: The Flash, Arrow, Supergirl, Legends of Tomorrow Crossover Trailer / Will Joe West Die During The Invasion! Crossover? / Enter To Win An Ultra-Rare Invasion! Crossover T-Shirt / Marc Guggenheim Talks Arrow's 100th Episode / Laurel Lance's Role in Invasion! Explained / Stephen Amell Talks Arrow's 100th Episode

Supergirl airs Mondays at 8 p.m. ET/PT; The Flash on Tuesdays at the same time; Arrowon Wednesdays and DC's Legends of Tomorrow on Thursdays. All four series air on The CW. The "Invasion!" crossover will air beginning November 28.