Board Thread:Spoilers!/@comment-27028649-20160418014259/@comment-25926288-20160418014701

It's not important enough to the writers. Red's time with Frankenstien was just a relevant and they never talk. So, it's just a think far in the past. Just a moment in time that went on.

So, they won't mention it or see it again. Sadly. Graham probably went to the worse place too.