Elizabeth continues to use the science lab secretly, utilising the computers to run calculations for a shrink ray. Elizabeth tests the device but it malfunctions and she is almost caught by Ms Vyner. Determined to find who is illicitly using the science lab, Ms Vyner and Tesslar install a security camera, recording anyone who enters the lab. Elizabeth is unwittingly caught on videotape successfully testing her shrink ray. When Toby finds out that she is going to be caught he realises that he too will be found out. Toby and Elizabeth rush to get to the tape before Ms Vyner. Ms Vyner almost catches them in the act but Elizabeth deflects suspicion onto Russ. Dina is furious at Toby for helping Elizabeth and the trio of friends seems to be broken up.