So if I'm getting the sequence of events right:
FIfe is founded and Zargothrax goes all supervillain
Gets defeated and frozen(end of 1st album)
Gets woken up in 1992, fails the ritual to bring forth Korvilliax, Earth gets blown up, and everyone gets sent back in time
Angus XIII kills Zargothrax, then goes to commit suicide(and gets isekai'd into whatever timeline Angus McSix is in now)
Zargothrax activates his clone, who travels forward to 1992-ish in the new timeline, and tricks Angus into freeing the original before the Chaos Wizards show up to free him originally? Which then leads into the new timeline mentioned by the other Angus in the previous single that mentions 1993?
I suppose this backstory also explains the otherwise weird reference in the 1992 album by Zargothrax about "saving the multiverse from slavery and fear" which isn't something you'd expect a megalomaniacal chaos sorcerer to say.