S.H.I.E.L.D. creates a genetic bath that will allow Bruce Banner to control the Hulk. But when the Hulk and Rick Jones are thrown in the bath by accident, a new Hulk emerges!
After reunite Hulk and Bruce Banner, Doc Sansom is following his health and its transformations at the lab.
In another place inside Gama Base, General Ross is doing some tests with SHIELD agent Quatermain, but now that the Hulk and Bruce is one again, they have to think about another way to defeating him without killing.
Then the Hulk manages to escape from the test machines and Bruce is trying to escape from inside him. The reunion hasn't susceed as espected. Doctor Sansom realizes the Hulk must go back to the solution tank, but General Ross has escape from SHIELD and is about to stop it. When Ross is about to destroy the controls, Rick Jones punches him, buying some time for the agents put Hulk inside the tank. But Rick also fells into the tank with the Hulk.
At the end, a Gray Hulk comes out of the tank, and then Bruce is back saying the Hulk is gone.