Okay this challenge will be a lost planet young justice crossover challenge.
the timeline could be in lost plant 1 or after lost planet 2 ending
a portal to the young justice universe but each faction have to get a portal to each location to their element like the snow pirates gets a portal to Alaska, Antarctica or Siberia, the sandraiders would have a portal to the middle east or any where with sand. the jungle pirates would be perfect with countries with heavy jungles the waysiders woulds be drifters fighting in wars for the highest bidder or helping out third world countries and you may now the rest of the factions read them up or you can always send one person to join young justice team or fall in love. the league has to have some clashes with them or meeting them in the young justice episodes
you could write that Wally could join the snow pirates mercenary group with no memory of being kid flash and suddenly he returned to the young justice universe as said your choice.
the the lost planet factions can have meta humans in there ranks and treat them with respect or curiosity. ex Nevec could make government to talk to the the governments of young justice earth. some technology 21st tech could be inc-operated in their arsenal and get them better equipment for some of the lost planet factions because you gotta admit some factions need better equipment or modifies said equipment.
you can put Akrid is your stories if you want or you make the countries pay the lost planet factions to deal with them because they are experts in killing akrid.
so good luck.
