4. Turn Left
I Love Donna! This is her 'It's a Wonderful Life/life not lived' episode with guidance from a time-jumping Rose. We see what could have happened if she had never met the Doctor and he'd died at Canary Wharf because she wasn't there to stop him from going too far, and it was brilliant to see the episodes we know and love flipped upside down and inside out. As the catastrophic events are unfolding, as all the stars are going out, we see that one person really can make a huge difference in the world. We never know how our words and deeds are affecting everyone we meet.
The Questions: What life choices would you change if you could have a do-over? Who would you not have met? What would you not have done? Do you wish you had chosen the other path?