The Doctor and his ever annoying companion, Jo, set their TARDIS down inside a peep show machine. This machine has the capabilities shrink matter, and store an entire ship, it’s crew and passengers. And that’s in only one compartment. The machine is topped with a beautiful CRT television, which allows those on the outside to watch what’s happening on the inside.
A traveling pair of entertainers or swindlers arrives on a planet with their machine in tow. They are penniless and ready to entertain the people of this planet with their machine of wonders.
Unfortunately the people on the planet don’t care. Unfortunately for the writers, nor do I.
It doesn’t seem very good con to get people to watch a CRT screen, but that’s all that these travelers have going for them… well that and their amazing outfits.
The Doctor gets out, and things happen, and everyone leaves happy. Except the audience.