“That’s the one.”
I looked it up, the episode was Aliens of London.
https://tardis.fandom.com/wiki/Aliens_of_London_(TV_story)
The backbencher was Harriet Jones. The aliens were the Slitheen family. Also the first time UNIT was involved.
Chris Eccleston was the Doctor.
The way Barney Frank, and Eric Swalwell are going, I think they might have a zipper on their foreheads, and really be aliens. Lol!