Velocity 9 is, in the comics ... He is toying with a substance that has its history in the lore of The Flash, so it’s something from the comics. He wants to try it on Jay to see if it works ...

assigning her a hard-hitting piece about the Flash's absence. Iris insteadoffers an exclusive with Jay, and he warily concedes. At S.T.A.R. Labs, Caitlin has created Velocity-9, designed to ...

Barry’s nemesis is also sick as a result of V-9 (which is why he wants to steal The Flash’s speed), much like Jay (Teddy Sears) fell ill as a result of an earlier version of Velocity.

Jay Garrick has been MIA for the last few Flash episodes ... when it comes time to fight Zoom again (and Velocity-6 sounds a lot like Velocity-9 from the comics). Harry wants to tests it out ...

But without his Speed Force, Caitlin makes him a drug, Velocity-9, essentially a speed steroid. It temporarily gives Jay his powers back. In “King Shark” Flash and S.T.A.R. Labs successfully ...