Gosh. What a look. He couldn't look any more 'villain' if he tried...
These costumes do look silly in harsh broad daylight like this, but use a little imagination and you can see this suit, and character, will be rather impressive once he reaches the screens.
Being sensible I can't see them repeating the same theme of an evil speedster terrorising all and sundry the entire season. Not three times in a row. So given The Flash returns October I am guessing this scene being shot is from later on in the season, I would almost be tempted to say "Johnny Quick!", but he could be anyone.
Wonder how they would react if a White Martian got loose on that earth?
They have speed, correct?