This one is intense! The creepy sound effects are somehow balanced well with the dialog - well produced.

A scientist develops a super-intelligent rat and sics it on the man who is having an affair with his wife. Rip off of the movie "Willard".

Another "scientist in a weird experiment awaiting a divorce" story again. However, this one involves a researcher on rattus norvegicus and their intelligence, who's having an affair with the wife of another researcher who's cunning and sadistic (played by Ralph Bell). The two scientists are in competition for the directorship of a laboratory...the good guy wins. Later, the man who made the decision is attacked and killed by a large rat named "Attila". (Remember the movie "Willard"?) Bell's character is upset, not only because he lost out to the other researcher for the directorship, but because he's about to lose his wife to the good guy. (Though it's a bit disturbing because even given the circumstances I'd not heard another RMT that painted divorce in a positive light.) Someone let the rat out who killed the director. Or did the rat let itself out...? ( Where's that CBS RMT cat when you really need him...?)