Pupils and their teachers have embarked on an extraordinary time-travelling adventure through seven eras of British history. Starting out in the age of Empire in 1895, they've lived lessons, life and dinners all the way through to the end of the 1990s, with their school as their time machine. Now they're returning for one last adventure. In this final episode of the series, the class and teachers return to school for their very own reunion party, where they'll be joined by presenter Sara Cox and social historian Polly Russell. As pupils, teachers and families celebrate together, they'll reflect on over 100 years of time travel, and explore how the legacy of the past lives on in the schools of today. But their journey isn't over yet, as our intrepid class of pupils set off to explore what the future of the classroom might look like. They'll experience the cutting-edge possibilities of virtual classrooms and contend with the unsettling notion of lessons run by artificial intelligence.