since DCEU too lazy to created great villian (just look at 'Doomsday' in BvS). JL film 1st opponent maybe:
JL vs Teen Titans
JL earth 1 vs JL earth 2 vs JL earth 3 vs JL earth 4
JL vs Super-Friends
JL vs Team Arrow
JL vs the Trumps
since DCEU too lazy to created great villian (just look at 'Doomsday' in BvS). JL film 1st opponent maybe:
JL vs Teen Titans
JL earth 1 vs JL earth 2 vs JL earth 3 vs JL earth 4
JL vs Super-Friends
JL vs Team Arrow
JL vs the Trumps