An earthquake causes the title creatures to emerge from their dormant state underground, where they'd hibernated for milennia. Seems the prehistoric insects are not your usual houseflies. Using a special set of antennae, they're capable of setting anything and anyone on fire. Entomologist Dr. James Parmiter (Dillman) makes matters worse by breeding the bugs and creating...a race of super firestarters!

Slow in spots, and Dillman's crazed experimentation with the bugs becomes tedious, but there are some gory deaths to recommend this and it's a perfect example of '70s sci-fi horrormaking gone wild. Directed by Night Gallery guru Szwarc.