Synonyms that are in the dictionary are marked in green. Synonyms that are not in the dictionary are marked in red.
Antonyms that are in the dictionary are marked in green. Antonyms that are not in the dictionary are marked in red.
It's linked to the Dark Circle -- cosmic terrorists spun off from Krypton's Black Zero -- who try to invade STAR Labs, leaving Bruce worried.
Source: https://www.cbr.com/legion-of-super-heroes-post-credits-sequel-setup-explained-dc/