Thunder of Gigantic Serpent (1988)

Plot

A terrorist organization steals a groundbreaking formula capable of massively enlarging plants and animals, but chaos ensues during their escape, leading to the formula's loss. A young girl unknowingly discovers it and uses it on her pet snake, which rapidly grows to an enormous size. This newfound guardian fiercely protects her when the terrorists target the child, unleashing a trail of destruction in its wake. As danger looms, the bond between girl and serpent becomes the key to survival against the relentless threats.