The game does a better job of explaining it that I can -- basically, your robot character has a TARDIS that lets you meet up with past versions of yourself to work together. Beware of paradoxes! (Since Jack clearly doesn't feel up finding a new game today, I'll try to level the playing field a bit by posting something classic.)
I mostly like old, unpopular things, like from 2002. I'm also 102 years old.
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