User:SOTO/Forum Archive/Inclusion debates/@comment-4028641-20170322025232/@comment-26845762-20170329024039
After going through this handy summary of the entire story, I'm surprised to say that I agree that all of these flashbacks should be considered valid. It seems that about three quarters of them are set in the period of Death's Head's life that began in The Crossroads of Time and ended in Time Bomb! in which he was stuck in the same era as Keepsake. Basically, it expands upon 8162.
The rest of the flashbacks appear to be either stuff set on some alien planet or stuff set in some sort of alternate timeline where the Fantastic Four, Iron Man, and She-Hulk exist in 2020 instead of "present day".
I'd say go the "The Worlds of Big Finish route" and cover the entire story.