In all seriousness, Stephen Amell’s Twitter photo is a good reason to get excited about the crossover aspect of the 100th episode.
The shot of Melissa Benoist as Kara with Amell as Oliver is a solid reminder that Episode 100 is actually smack dab in the middle of a crossover extravaganza.
Earlier pics teased the appearances of versions of Robert Queen and Deathstroke, both of whom are distinctly Arrow characters.
I’m still crossing my fingers that Arrow doesn’t have to spend its entire 100th episode showcasing other heroes from other shows, but I’m also looking forward to seeing how Supergirl plays into the more grounded world of the Green Arrow.