The brothers Hop Pyleen are among the several alien dignitaries who visited the space station Platform One in the year 5,000,000,000 to witness the destruction of Earth.

They appear as strange-looking humanoids, hailing from the clifftops of Rex Vox on the world of Rex Vox Jax, and are celebrated as the inventors of the Hyposlip Travel System. Their species is known to be cold-blooded.


  • Doctor Who, series 1 - "The End of the World" (2005)
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