My name is Wally West, and I'm the fastest man alive.
When I was a boy, my aunt Iris dated Barry Allen. Neither of them really knew each other when it started out. For instance: Barry Allen was the Flash. For instance: Iris West was actually from the future, the 30th Century, to be exact.
I grew up idolizing Barry, becoming a charter member and president of one of the largest Flash fan clubs in the country (or at least in all of Blue Valley). One day, Iris invited me to Central City so I could meet her boyfriend. What she didn't know was that I would become involved in an exact replica of the accident that gave The Flash his powers.
And what Barry didn't know was that his future bride had been sent as a child to watch over him, her life essence transported over a millennium in order to watch over him.
Barry talked in his sleep; that's how Iris found out about his double life.
The Reverse-Flash murdered Iris; that's how she found out about hers.
The Reverse-Flash is Eobard Thawne, a nobody from the 25th Century, a janitor who worked at the Flash Museum, working day after day under the legacy of Barry Allen. Eventually, he became obsessed, found a way to give himself Barry's powers, and decided that the only way to step out of the shadow of his assumed nemesis was to destroy him.
He tried many times before finally succeeding, sending his vibrating hand through my aunt's skull, killing her instantly.
Or so we thought.
Barry wouldn't know it for years, but his life had already been ruined by Thawne. The Reverse-Flash killed Barry's mother when he was very young, a death that haunted him throughout his life, and motivated him to enter law enforcement, trying to solve a murder that had been pinned on his own father, Henry.
Thawne wasn't the only foe to tamper with Barry's life. There was also Abra Kadabra, who came from the 64th Century. But we wouldn't know that until Barry killed Thawne. And the trial of The Flash began.