The Treasure Hunt is coming together with the discovery of another vital clue in the race to the Quantum Nexus, but the return of Ernesto leads to questions - exactly whose side is the Rebel on? Later on, Reese sees Muna and it is revealed that Muna came back in limbo at the Sparticle Mystery. Muna also tells Reese that it is dangerous to realign the 2 worlds as there are many more dimensions that could destroy them. Later on, it is discovered that Sadiq tells the other Sparticles that Serena is a double agent.

• Jon East, Jonathan Fox Bassett, Tim Whitby

• Annette Badland
• Larissa Wilson
• Jerome Holder