According to TVLine, the major crossover between The CW’s twin superhero shows Arrow and The Flash is being preceded by a smaller one as a new Flash villain and a returning Arrow villain team up to challenge Barry Allen (Grant Gustin).
While The Flash foe is unknown, the returning Arrow villain is William Tockman (Robert Knepper), aka the Clock King, who was last seen in Season 2 Episode 14, ‘Time Of Death’, stealing a hacking device so he could attack bank vaults.
Executive producer Andrew Kreisberg said, “We wanted to give Barry a real challenge… TWO bad guys! Barry will be fighting both a new enemy and one of our scariest and most successful Arrow villains in the Clock King.”
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