At the end of the episode the old woman is revealed to be a young woman wearing a rubber mask.
Obscure British children's show had a serial where a chair-bound woman removes an old lady rubber mask to be very very large tits as a man James Bree was billed as "Henrietta Rudkin" to hide the deception.
Impossible parody, Sharon Lawrence and Leah Remini both take off rubber masks of each other.
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Not even a full head.
The passenger asks, "What's going on?!
Also, a feature in "Cinefex" magazine about the film contains many photos of the rubber suits used in the film.
Tahnee Welch takes off her "human" skin revealing she's an alien.
At one point one of them goes to the police in the disguise of an old lady.
Based chubby teens nude pics the book, at the end, the twins Shane and Shana turn out to be aliens, but in this TV special version, they both including the girl unmask to reveal the aliens.