In which we more or less prepare you for the upcoming feature film; Rachel Summers is a black hole of continuity; Kitty Pryde breaks the Danger Room; Earth 200500 is clearly the best earth; even the X-Men have no idea what's going on; First Class Emma Frost is so boring that we forget she exists; wolverines are definitely not wolves; and you can have Rachel's Community references when you pry them from her cold, dead hands.

X-Plained:

Rachel Summers
"Days of Future Past"
Gravestone engraving standards of 2013
The Mostly-New, Mostly-Different Brotherhood of Evil Mutants
Another unfortunate hat
Causality in the Marvel Multiverse
Earths 811, 1191, 295, 311, and 200500
Hall monitors with laser rifles
How to fix a broken timeline
The X-Men cinematic universe, and points of divergence from the comics
The one thing X-Men: The Last Stand does right
The Xavier Index of Cinematic Continuity
The difference between Canis lupus and Gulo gulo
A Days of Future Past cinematic cram course
Fix-it fic
Blink, Bishop, and dark-future mash-ups
The enduring appeal of Earth-811
The significantly less enduring appeal of Earth-242
The Nazi Excalibur of Earth-597

You can find a visual companion to the episode – and links to recommended reading – on our blog.
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Next week: Greg Rucka, Cyclops, and Starjammers!