Flash has an uncontrollable urge to do something he should have done WAY before he walked down the aisle...and a bum ankle to boot!...
Monkey see, monkey do - no, wait, I'm getting my monkey metaphors mixed up! Flash suddenly loses the abilitiy to see, hear, or speak...
Flash has his dissipating hands full when the whole of Central City forgets he ever existed! PLUS, Abra-Kadabra switches minds with a 64th-Century fashion...