From January 1983: EAGLE issue 44 takes a brief break from the ongoing RETURN OF THE MEKON storyline (albeit now running under the Fireflight title) to recount the history of the Treens. Script by Pat Mills, amazing art by Ian Kennedy.
The revived DAN DARE strip (featuring - for TV licensing reasons - the grandson of the original Pilot of the future) often played fast-and-loose with the continuity of the original strip so I have no idea if - and how - it fits together but readers in 1983 wouldn't have been much the wiser escept via the hazy memories of their own parents (the original Eagle, a shadow of its former self, shuttered in 1969) and the - rather nice - compilation books of the original strips published around this time.
I've long maintained that the RETURN OF THE MEKON strip (along with the photostory era of DOOMLORD... which STARLOGGED has covered in the past) really needs to be reissued in a decent format. And I think these three pages demonstrate that.