After the first film It's Alive about a mutant baby that's a real killer fresh from the womb, it was decided a sequel was in order. The first must have made a few dollars, that is how these things are decided.
Returning from the first film is John P. Ryan the father who killed his own mutant and now has a mission in life, maybe to save others who are now showing up in the population. Which is why he visits Frederic Forrest and Kathleen Lloyd another expectant set of parents.
After that things get real silly as the all seeing government in the person of John Marley gets into the act. There's also an institute that wants to house and study the mutants that's headed by Andrew Duggan. All these plot elements combine for one bloody ending.
Not that the first film was a world beater, but it's Citizen Kane next to this.
