Assignment I: Escape through a Crack in Time (2) (S01E02)

Sapphire and Steel discover that Helen's bedroom has become the epicenter of a time fracture triggered by the chanting of nursery rhymes. Just in time, they avert a catastrophe, and Steel secures Helen's door to keep the creatures trapped inside. Meanwhile, Rob grows increasingly suspicious of the enigmatic agents and sees an opportunity to flee when a police officer appears the next morning. However, Sapphire outsmarts him, ensnaring the officer in a time loop to ensure no one disrupts their efforts.