Board Thread:Warhammer 40k General Discussion/@comment-25222488-20140827235621/@comment-9026161-20140828013948

The Doctor would know if Chaos, Orks, Eldar, or anything else like that was in existence, and we would not see all of the different types of life that we do because the only races would be those of 40K, The Emperor would also know about the Doctor and might possibly just straight up kill him psychically. So no, it would not be "Epic" it would be full of plot holes and things that simply WOULD NOT END UP HAPPENING.