Iris and Wally join the team, and everyone seems to be having a good time.
She is obviously reticent, and so she attempts to talk her boss down from this crusade.
The two hash this out over coffee, a meeting which he misconstrues for a date.

Credit: Katie Yu/The CW
But whatever romance lies ahead is for another week.
END ASIDE)
Caitlin finally fills Barry in on Velocity 9 and its effects.
So she and Joe head out to visit Eliza Harmon, who greets the two with open arms.
formerLaw & Orderactor Jesse L. And shes not alone.
And Trajectory has a plan in mind to find more of the juice.
Trajectory breaks into S.T.A.R.
Yet even though Jesse is thankful to be alive, shes not thankful for her fathers behavior.
Harrys only concern in life is keeping Jesse safe, but she thinks maybe it shouldnt be.
This time, Barry succeeds, taking Trajectory by surprise and hoping to put an end to it.
She has other results in mind, and threatens Barry by taking out the V-9 from the lab.
Barry attempts to do his best to talk her out of using it.
She sparks up with more energy than ever before, boasting about being faster than the Flash.
Its a gross, disturbing end, but one that leads Barry along to the path to answers.
Her lightning was blue because of the V-9.
Zooms lightning is blue.
So Zoom must be sick.
(They have seen speedsters in two places at once before, after all.)
Luckily, they believe they have a way to find out.
Jay is Zoom, and once again, Barry must deal with assumedly being betrayed by a mentor.