"The Death-Touch of the Blue Ghost"
Shortly after the Allens and their nephew Wally West arrive at their vacation destination, Barry and Wally have to assume their alter-egos of the Flash and Kid Flash to investigate the appearance of an alien. Once finished, they return to Iris and their room to resume their vacation. Inadvertently the Flash touches Iris and she suddenly begins to age at an amazing speed. Heart-broken after hearing news from her doctor at the hospital, Barry refuses to ever wear his Flash costume again.