Phineas, Ferb and the gang get involved in the accident which causes Gamma Radiation! Thankfully, Adam, Ferb and the gang survives. Phineas & Isabella also survives, but they get infected by Gamma Radiation and it causes Phineas & Isabella to get angry and transform into Hulk and She-Hulk! Now, Adam, Ferb and the gang must create the cure in order to get Phineas & Isabella back to normal. Luckily, Bruce Banner & Jennifer Walters is there to help them.