Barry allen was an ordinary forensic scientist unntill he got struck by lightning.his DNA is mutated by a dark mater exploshon from a particle acclerator and he entered the speedforce, possesing increased body functioning speed. Which helped him to move fast, catch bullets, pass through solid objects, time travel and many more abilities. He became the flash of central city.
In the first season the villan is from the future and he is very smart. In the second season a villen from anothe planet, in the third the flash him self becomes the villen and on the fourth season a meta human who has the ability of immeshurable taught cames. This is the best scienc fiction series that I have watched, and I am still watching