Jay Garrick arrived in Central City from Earth 2 at the start of Season 2 following his defeat at the hands of Zoom.
The episode also saw the return of the powers of Jay Garrick. In an interview, Sears said that his character was summoned to the S.T.A.R. Labs in an urgent matter from Wells.
It turns out that Wells wanted him at the S.T.A.R. Labs because he wanted to make him his guinea pig for an experiment to make speedsters run even faster.
He said that Wells wanted to try it on to him because Barry needed all the help he can get to fight and defeat Zoom. Initially, Jay would have second-thoughts about it but due to some life-threatening moments, he eventually agreed.
In addition to becoming faster as a result of the serum, Barry Allen also discovered a brand new superpower which he eventually exhibited during the fall finale of the TV series that aired on December 8.
Noticeably, while Barry gets stronger because of his commitment and dedication to rid the Central City of criminal elements, his love life, on the other hand, is taking a turn for the worse. But the emergence of Patty Spivot changed everything for Barry.