The Sparticles travel to an abandoned mill where a supposed creature has been eating children. There, Tia and Jeffrey's relationship comes under strain and Rocky shows his true colors as he snatches the necklace Tia gave to Jeffery and throws it in the River blaming Jeffery for the incident. The Sparticles get their next clue, which leads them closer to the Quantum Nexus.

• Jon East, Jonathan Fox Bassett, Tim Whitby

• Annette Badland
• Larissa Wilson
• Jerome Holder