Slugs VHS box cover art. Movie starring Michael Garfield, Kim Terry, Philip MacHale, Concha Cuetos. Directed by J.P. Simon (Juan Piquer SimÃ³n). 1988.
From the VHS box cover:
Unusually large slugs in the garden. Partially eaten corpses. And the ghastly death of a young couple amid thousands of slime trails. All are gruesome pieces of a horrifying puzzle — a puzzle whose solution can mean only one thing. Carnivorous slugs are killing the people of Ashton!
An investigation by Health Inspector Mike Brady yields startling results. Long-buried toxic waste is causing a mutation in common garden slugs, turning them into a rapidly growing population of man-eating monsters. And if Brady’s theory holds up, it is only a matter of time before Ashton is completely consumed by the slimy horde.
With time running out, and with no help from the skeptical authorities, Mike takes matters into his own hands. Armed with a special toxin, he struggles in a desperate, last-ditch effort to save Ashton from a slime wasteland!
Bonus back cover scan:
This VHS not for sale. Available in a Special edition Blu-ray at Amazon: