Arrow: Season 5, Episode 8

5 - 8: Invasion!

The Dominators abduct Oliver, Thea, Sara, Diggle, and Ray, and imprison them in a shared hallucination giving each of them what they want most. Meanwhile, Felicity calls in Cisco, Flash, and Supergirl to help Mr. Terrific, Wild Dog, and Ragman find a piece of stolen technology they need to locate their missing comrades.