'Arrow' spoilers: 5 things to know about the Flash's arrival in 'The Scientist'

"Arrow" fans! The upcoming episode, "The Scientist," introduces Barry Allen (Grant Gustin) -- the man who will soon be known as the Flash. What's coming in this excellent episode? Check out five big spoilers here.1. Barry Allen has a rather impressive entrance into the episode. It highlights just how much of a clumsy nerd this guy is -- before he becomes a superhero anyway.2. There have been few episodes of "Arrow" in which the events on the island and the events in the present-day parallel as perfectly as they do in "The Scientist." Flashbacks in this episode are absolutely essential: Dr. Ivo's work didn't stay stranded on that island.3. People who have been upset that "Arrow" doesn't have enough comic-book themes like super-strength and pseudoscience will absolutely love "The Scientist."4. Felicity (Emily Bett Rickards) and Barry hit it off right away. Nerd calls to nerd, after all. Look for Oliver to have a very...



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