Whilst advancing through the time warp a severe storm in 1944 causes Gary to split into two opposing clones: a normal Gary and a bad version. Phoebe likes the former, while Yvonne prefers latter.

Gary and Yvonne have a bust up which ends with Gary having to move out and into Ron's place. During Gary's estrangement he becomes suspicious of Yvonne's interior designer. Meanwhile over in 1944, Phoebe suspects that Gary is having an affair with Yvonne, and Reg contracts impetigo.

Gary has to think fast when both of his wives decide they want to emigrate to California. In 1944 Reg retires from his job, but no one turns up at his leaving do.

Gary and Phoebe are cast in Noel's film Brief Encounter, but Gary declines. Meanwhile, both Phoebe and Yvonne catch the attentions of other men, which Gary resents and intercepts.

A foggy night in London leads Gary into the unknown time territory of 1880. Here Gary comes face to face with the notorious Jack the Ripper, who manages to access the time portal.

Gary thinks that Yvonne is having an affair, so he asks Ron to spy on her for him. Plus, Gary and Phoebe join a concert troupe in Belgium, but their efforts are quickly thwarted.

Gary and Phoebe come up against the bully tactics of a protection racket, so Gary utilises his modern gadgets to halt their reign of terror. Plus, Yvonne receives a rude surprise.

Gary must ensure that a compromising photo taken of him in the 1940s avoids discovery in the present. Yvonne goes to see Noel Coward's Gary and Phoebe stage play.

It's1945 and VE Day celebrations are in full swing. Future Prime Minister Clement Attlee is in town to join in with the festivities. Gary finds himself rushing to Attlee's aid when disaster strikes.