Mr Smith, an alien supercomputer called a Xylok that was freed from under the Earth's surface, concocts a story where Luke is the son of two humans, Jay and Heidi (who are actually Slitheen in disguise), and not created by the Bane.

Mr Smith suggests that Sarah Jane visits the Pharos Institute, a research centre where alien technology, whose plans were scavenged by the Slitheen, is being used to harness telekinetic energy.

Predicting Luke would return to the attic, while double-crossing the Slitheen, Mr Smith holds Clyde hostage, forcing Luke to use his mind and the headset to pull the Moon towards the Earth, to serve Mr Smith's purpose of releasing other Xylok from within the Earth at the cost of the planet.

The Moon returns to its original position, K9 goes back to guarding the black hole, and the Slitheen leave Earth.

The Cult Editor for the website, Ben Rawson-Jones, noted a similarity with some Doctor Who stories wherein "the formula of an old enemy from earlier in the series returning has been closely adhered to.