[Aoi Kurenai]

Quote:

Originally Posted by Dr Kain

I meant how he knows the arc on Earth is only going to be up to episode 13.

That's just a guess based on Japanese TV seasons (and coinciding toy quarters) running in 13 week blocks. So around 13 and 26 is a good place for the conclusion of a story arc. (if you look back, a lot of major Sentai episodes happen close to episodes 13, 26, and 39)