Mina has always wanted to visit the stars. Having grown up in a trading port listening to stories of far-off galaxies, it's difficult not to have some sort of desire to travel. Unfortunately for now, she's stuck waiting tables and gossiping with tradesmen in the hope of catching a glimpse of adventure. Enter the Doctor, a Time Lord. He's in search of an old friend, and thinks Mina can help him find her. Eager to rise to the challenge, Mina joins the Doctor on his search - however, on her journey she will be travelling to a place she could never have imagined. And what will happen in this world if you touch the water?