1x7 - Hammer House of Horror

A hard-up young convict, Chuck Spillers, strikes up a friendship with Martin Brueck, an elderly prison visitor who owns a pet shop. When Chuck is released, he is glad to take a job working in the shop where Martin reveals he keeps a number of large cats in cages and is experimenting in controlling animals by electrical force fields and bells. Unfortunately for Chuck, his desperate need for money lures him into danger.