I changed my mind.
I still love this episode and wouldn't change my score but I feel it could have been told without Krasko. There was really no need at all for a villain.
Well you kind of need some kind of reason to get the Who Crew involved. Otherwise history would unfold just like it did and they would have no reason to get involved. Plus it's a Sci-Fi show so you do needed that Sci-Fi angle as well. I think I might have made one change though. Instead of the far future what if the guy was from the 1950's. Somehow got hold of the time travel device, went to the future and got a glimpse of the end result of the civil rights movement and then returns to his time in order to change it. Instead of being sent to the past as punishment at the end he is actually sent to a future where his behavior is no longer accepted.
Jason