Finally catching up to the Leader in the present, Hulk reunites with the Agents of S.M.A.S.H. as Leader uses the powers of his time belt to summon paradox monsters from the alternate timelines like a Gamma Dinosaur, a Sauron/Frost Giant hybrid, a Vampire Devil Dinosaur, and the Red Skullasaurus. During the fight with Leader and the paradox monsters, Hulk is unexpectedly whisked into the future by teenage Smashers consisting of Leader's rebellious son Junior, RJ3, and twin siblings Thad and Betts. The 3rd Generation Smashers need Hulk's help battle the threats of L.E.A.D.R. (the consciousness of Leader in a robot body) who plans to replace everyone on Earth with Leader clone versions of themselves while the real humans are placed in the Negative Zone.