If you are talking about the monsters from Series 1, even in that case they were the result of someone creating an explicit paradox (Rose knowingly changing her own history by saving her father from a car accident) not someone simply bumping into a past version of themselves (like future Amy and Rory waving to…

It is not physically impossible for any time traveler to crossover with themselves (it has briefly happened with companions too) It is just ill-advised because it comes with the risk of paradoxes

1 - If you had a time machine, you could in theory, go back to a couple years ago and hang out with the younger version of yourself. That's all that has happened here, and the show has dealt with that conceit several times.

This

1 - This phenomena has happened before. When time-lords cross over with their past selves, their recollection is vague. Missy only kinda remembers that one time she someone told her to keep a spare TARDIS parts with her at all times. In Day of the Doctor, 11 only vaguely remembered what he did as the 10th Doctor. He…

I have to keep defending my fellow Americans on Trump. It is terrifying that he won a major party's primary. But he didn't win the popular vote here, he was upagainst a notoriously unpopular democratic candidate and he has record low approval rating!

This two parter was the cyberman's orgin story. So we know at least some of them get off the ship

I was 9 in '95. But I actually remember the pre-windows '95 computing (like DOS to access computer games) because I was in a family of early adapters.

My introduction to Star Wars was the big 20th anniversary push where the movies got rereleased in theaters just before Phantom Menace. Middle school was about the cut-off where I could sort of enjoy the whiz-bang but it not be a thing that really captured my imagination outside of Darth Maul.

My have a friend born in '95 who teaches high school now

As a child of the late '80s, I actually had a conversation with my younger sister about this who was born in '95.

I'm going to remember this comment when that article inevitably happens.

Maybe we should envy those kids born after 2000 who are too young to have ever seen Wild Wild West.

If you were in 9th grade 2000, only out of college for a split second before the housing bubble, and barely 30 when "Why aren't millenials buying diamonds" happened, you don't get to escape the millenial label. You're stuck here with the rest of born in the late 80s and early 90s.

Well, at the very least, we're probably on our last boomer president.

As someone who likes Hell Bent and Wedding of River Song, "Pandorica Opens/The Big Bag" will also always have a special nostalgic place in my heart.

If it weren't for this message board, I wouldn't even know what the Valeyard is

I think it is more that people disliked the idiosyncratic style of episodes like that applied to story arcs.

This show has been hinting that the next Doctor could be a woman since the moment Matt Smith noticed his hair was usually long yelled "I'm a girl? No, I'm not a girl!"

The guy River was married to in that episode was shady. But Narodle himself did not make a giant impact on me when I saw that episode. I did not anticipate him becoming a companion.