Rose rescues her dead dad; Jackie is immortal; and in the end we forget that our hero is a cheating, lying, lousy husband.
We start the episode with Rose telling The Doctor that she wants to go back and see her father. Sadly, she never got to know him, as he, Pete Alan Tyler, passed away in a traffic accident in 1987 when she was just a baby. That would qualify as a rather nice, sympathetic time travel request. But things are about to get weird. Once she’s seen him alive, she then wants to go back to the point when he died. And for some reason, The Doctor agrees to this. Twice.
Rose disobeys The Doctor’s direct command and intervenes, saving her dad’s life, and hey-presto, we have ourselves a paradox.
Suddenly Reapers, time-ingesting demons who may be there to right the wrong and thus ‘Final Destination’ Pete out of the world of the living, or who may just be a temporal plague consuming all life in the universe, appear out of nowhere, and suddenly Doc, young adult Rose, baby Rose, Pete and 40-year-old teenage Jackie must hole up in a church and figure out how to clean up this mess.