Was this an episode of TOTU

I remember an episode (but I'm not sure if it was tales of the unexpected) about a family who discover that their house has been encased in metal trapping them inside. The temperature slowly rises and the wife becomes more and more paranoid. She eventually notices that a tattoo on her husbands arm is also to be found on cans of food in the kitchen and items of furniture etc. The twist is that at the end we find that they are electronic dolls whose house has been placed in the oven by the brother of the little girl owner. I'm sure that the last line as the mother pulls the dolls out is that if they have to be sent away for reprogramming, the little boy will pay for it cos he knows that heat makes them a little mad.

If anyone can remember what this episode was called or whether ir came from another series such as outer limits I'd be very grateful.

Many thanks