Thawne's Cosmic Speech In The Flash Explained: All References & Teases
Warning: The following contains SPOILERS for The Flash season 8, episode 18.
Eobard Thawne gave a speech full of Easter eggs regarding the cosmic side of the DC Comics multiverse, hinting at the future of the Arrowverse and providing a setup for The Flash season 9. The imprisoned Reverse-Flash lived up to his comic book alias of Professor Zoom, offering viewers an educating lecture on a number of subjects. Just how Thawne knew about some of the things he spoke of is a mystery awaiting an explanation, but there is little about Barry Allen's nemesis and the breadth of his knowledge that is shocking after eight seasons.
One of the biggest surprises in The Flash season 8 was the unadvertised appearance of John Diggle (David Ramsey) in episode 18, «The Man in the Yellow Tie.» Formerly the vigilante Spartan and right hand of Oliver Queen on Arrow, Diggle had spent the two years since theseries finale of Arrow seeking the meaning of a strange box containing a glowing green object, which had crashed to Earth near him as he was preparing to leave Star City. Some believed that this was the payoff of a long-teased rumor that John Diggle would become the first Green Lantern of Earth-Prime.
Related: Did The Flash Just Explain Why Reverse-Flash Became Evil?
With the most knowledgeable scientists of his era unable to find an explanation for the headaches Diggle had begun experiencing since acquiring the box or a way of opening the box a second time, he sought out the Reverse-Flash Eobard Thawne (Tom Cavanagh) in the hope that he might have some answers, being a scientist from 200 years in the future. Thawne did indeed know something of what the box truly was and agreed to help Diggle in opening it again and claiming the power it had to
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