What if there are parallel worlds? Our human dominated world, and another, where dinosaurs survived and so evolved a reptile dominated world? And what if you could pass between them? Matt and Dave go portal diving with the first ever film adapted from a video game: the big concept extravaganza of Super Mario Bros. Along the way they explore the intertextuality of games, movies, and comics, and philosopher Gilles Deleuze on incompossible worlds.