Bradford Dillman
This film started off fairly awkwardly with some very weak performances and unconvincing special effects, but once Bradford Dillman came onboard, I started taking it seriously because he took his role very seriously.
Without the professor at the helm, this would be just another flaming cockroach film.
I'm sorry that Mr. Dillman no longer makes films, but he was one of the hardest-working actors in Hollywood back in the day, and by all accounts he had no ego whatsoever. We could use more actors like him in this day.