MarkB
Legend
I haven't seen that one, but Doctor Who did a lot to popularise the "fixed point in time" concept. I think the episode "Father's Day" is the best example of tackling exactly the themes present in this episode, and for me, it pulled it off with more emotional resonance than the What If episode.Not to be picky, but I do believe that road should have had a no passing sign due to the curve ahead. Absolute point is also done in the remake of the Time Machine. Save the girl, no point in building the time machine.
The other example that comes to mind is the anime series Steins;Gate. That one goes into much more detail, especially regarding the extreme personal cost of trying to shift or undo that one precipitating event, and it does so while consistently delivering emotional gut-punches along the way.