In episode 166 Jo welcomes back Jeff Downes & Graham O'Dwyer from At The Flicks, to explore science fiction cinema. They focus on films that have the themes of alternate realities and parallel universes, including Back To The Future 1 & 2, Source Code, Groundhog Day, Sliding Doors and Everything Everywhere All At Once.

Plus science journalist Paul Rincon shares some of his favourite multiverse movies.

Presented, produced and edited by Jo Durrant.

Music licensed from Purple Planet.