A common chimpanzee is found floating in space, returning from years of suspended animation in his ship. It turns out the chimpanzee, named Titano, was a beloved companion of Lois during her childhood. In space, Titano encountered a radioactive asteroid, causing him to mutate on Earth and become big trouble for Superman and Metropolis.

To carry his father's favor, the New God brute Kalibak goes to Earth to destroy Superman. Meanwhile, Clark's adopted parents, Jonathan and Martha Kent, are visiting him in Metropolis for Father's Day. The city takes a beating as the two sons battle it out.