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Mark Mardon, having survived his apparent death during the black-matter explosion, returns seeking revenge on Joe for the death of his brother Clyde... and has the same weather-manipulation powers as his deceased sibling.
Episodes
1Pilot 2Fastest Man Alive 3Things You Can't Outrun 4Going Rogue 5Plastique 6The Flash is Born 7Power Outage 8Flash vs. Arrow (I) 9The Man in the Yellow Suit 10Revenge of the Rogues 11The Sound and the Fury 12Crazy for You 13The Nuclear Man 14Fallout 15Out of Time 16Rogue Time 17Tricksters 18All Star Team Up 19Who Is Harrison Wells? 20The Trap 21Grodd Lives 22Rogue Air 23Fast Enough