20 Million Miles to Earth

A United States spacecraft crashes into the sea near Sicily, returning from a mission to Venus. Among the wreckage, a local boy discovers a container holding a gelatinous egg, which he sells to a zoologist. Unbeknownst to them, the egg quickly hatches a small creature that begins to grow at an alarming rate due to Earth's atmosphere. The creature, initially docile, escapes and starts to roam the countryside, searching for food and inadvertently causing panic.

As the creature grows larger and becomes more aggressive, the military, along with American and Italian scientists, scramble to capture it while dealing with the public's growing fear. Efforts to understand the creature's biology and find a way to stop its rampage are complicated by its incredible growth rate and increasing hostility. The situation escalates as the creature makes its way to a densely populated area, leading to a confrontation that puts the lives of the protagonists and the creature itself at significant risk.