Things got personal for Billie Piper as the Ninth Doctor's coveted companion in this critically acclaimed Series 1 episode when she travelled back to 1987 to the day of her father's tragic death. After breaking the rules of time to save his life, the deadly Reapers were unleashed to sterilise the wound and it all came down to Pete who heroically sacrificed himself to put history back on track. A harrowing story which was responsible for the nation taking Rose Tyler to its heart.