Goodnight Sweetheart S05E03 - When Two Worlds Collide

When an unexploded bomb detonates at the entrance to Duckett's Passage, the time portal between the 1940s and the 1990s is damaged and Phoebe unknowingly follows Gary through to 1998. Meanwhile, Reg receives a blow to the head that vastly increases his intelligence, and Gary enlists Ron to look after Phoebe in 1998 and keep her away from Yvonne.