After a terrorist with an implanted nuclear detonator gets shot, a team of scientists must defuse the bomb by miniaturizing themselves and going into his bloodstream. His organism's antibodies start to mass against them.
A baby alligator is flushed down a toilet and survives by eating discarded lab animals that have been injected with growth hormones. The now gigantic animal escapes the city sewers and goes on a rampage, pursued by a cop and a big-game hunter.