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If you can find a copy, the Legion Sourcebook has a lot of background info written by the writers at the time

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I think it's supposed to be his daughter. The credits show a her as "Rebecca McNider"and the older woman as "Myra McNider" who was his supposed to be his love interest in the Golden Age comics

I think it's a shame that with all the music biopics that have come out, there was never one of J. P. Richardson aka "The Big Bopper"

https://en.wikipedia.org/wiki/The_Big_Bopper

But I guess...

One that is wished lasted long was Hindsight


https://www.youtube.com/watch?v=DmPkNF5iO5k

Lasted 10 episodes on VH1 in 2015, Laura Ramsey plays Becca, a woman who goes back in time 20 years to...

I'll try and do my best to explain things...

At the end of Crisis on Infinite Earths #10, the universe was rebooted from a multi-verse combining Earths-1,2,4,S & X into a singular universe....

The comic you're looking for is All-Star Comics #69
https://www.comics.org/issue/31598/

That looks like Blockbuster

2) Jericho from New Teen Titans
3) White Witch from Legion of Super-Heroes (notice the antenna) :D
4) Shadow Lass from the same team
5) I think that might be Firehair (old Western character from...

Sounds like you're thinking of the Destiny's Hand storyline from around the time of Death of Superman

http://crisisonearthprime.blogspot.com/2011/10/jurgens-league-destinys-hand.html

It could be the Superman Spectacular
http://www.comics.org/issue/96273/