In the fourth episode of Hammer House of Horror, Gary Bond plays a scientist whose son dies after eating some toxic proteins that just happened to be lying around the lab.  The scientist’s wife (Barbara Kellerman) goes down to the local orphanage to collect a new son but this new kid turns out to be more than a little creepy.

This bizarre episode originally aired, in the UK, on October 4th, 1980.  A quick warning: This episode does feature some dead rabbits.  I like rabbits so that bothered me a bit, even though it made sense in the context of the story.