A black hole hits North Wisconsin and opens a door to other dimensions. Giant 15 meter spiders emerge from it, who have an appetite for human flesh! Two NASA scientists try to save the world.
| Actor | Role |
|---|---|
 Steve BrodieDr. Vance | Dr. Vance |
 Barbara HaleDr. Jenny Langer | Dr. Jenny Langer |
 Robert EastonKester | Kester |
 Leslie ParrishEv | Ev |
 Alan Hale Jr.Sheriff | Sheriff |
 Bill WilliamsDutch | Dutch |
| KKevin BrodiePerkins | Perkins |
| DDiane Lee HartTerry | Terry |
| TTain BodkinPreacher | Preacher |
| PPaul BentzenBilly | Billy |
| JJ. Stewart TaylorDeputy | Deputy |
 Christiane SchmidtmerHelga | Helga |
| WWilliam W. Gillett Jr.Rider | Rider |
| DDavid B. HoffHelicopter Pilot (voice) | Helicopter Pilot (voice) |
 Joel ThingvallGas Pump Kid (uncredited) | Gas Pump Kid (uncredited) |