Etta Candy's father had become an obsessed fan of the Flash, and left behind a heartbreakingly vague note about a secret society of superheroes he'd built. He wanted the group to create a haven for kids, and created a giant floating island named "Cave World" for the purpose of doing so. The island, a fake tourist attraction that offered "real adventures" using holographic images, contained a secret amusement park, where Barry visited repeatedly while growing up. The island was also the setting for a series of "Word of the Flash" comics, which were all tied together by the legend of a "Caveman" who had once lived on the island long ago.
While at a museum, Patty took Barry to see an ancient mosaic, and she claimed that it depicted the well-known "Caveman" character. The true Caveman, Maurice, had been a character in the DC Universe for a while, and had a distinct physical appearance. It turned out that Etta Candy had stolen his identity, and that Maurice was the true "Caveman" of the island. Maurice told Barry that he left the island because he was a bad guy, and once Barry had his powers restored, Maurice threatened to kill him if Barry continued to expose him.
Throughout the season, Barry struggled to deal with his powers, understanding them but also having to re-learn how to control them. He continued to feel guilty over his unreciprocated feelings for Nora. When Iris became gravely ill, Barry attempted to use his powers to heal her, discovering that he had grown even more powerful with the Speed Force. He then came to terms with the fact that Iris was dying, and decided to keep going on with her life, no longer afraid to let her die if that meant she could live.
Kathy started moonlighting as a reporter for a new superhero-centric comic book magazine called "The Flash" to raise money for her brother's drug treatment. After unsuccessfully searching for the Scarlet Speedster himself, she was informed of Barry's adventures, and came to full witness him gaining his powers as a Flash. d2c66b5586