The Dominators’ use of mind control was the perfect way to split the episode in half and do justice to both the 100th episode milestone and the crossover.
While Oliver was in his hallucination world with Diggle, Thea, Sara, and Ray, the rest of the heroes were rallied by Felicity and Cisco for a rescue mission.
“Invasion!” was an episode with two distinct halves, and it really worked.
I’ll admit that I had my doubts when news started to break that the Arrow crossover episode would somehow bring back Laurel, Moira, Robert, and Deathstroke while there were already four shows’ worth of characters running around.