Doctor Elehri Mussurana has spent a lifetime on her work. She's guarded her pet project close to her chest, letting only one person share her secret - her husband and lab partner Ernst Wharner. As their experiment reaches its final, glorious fruition, they watch in awe as sparks fly in a sealed chamber and specks of sapphire light begin to join together into a shining haze. A wormhole in time and space is being created...But then something unexpected appears inside the swirling vortex: a tall blue box with the words 'POLICE PUBLIC CALL BOX' on the side. The TARDIS has arrived in the far future, in a scientific research facility - just as reality is ripped at the seams and the universe tears in two...