Injustice 2’s newest trailer features Raiden and oh, by the way, another character with lightning powers — Black Lightning.
Black Lightning is in fact a “premiere skin” for Raiden, as part of Injustice 2’s Ultimate Edition. Raiden, Black Manta and Hellboy will come to the game in October in Fighter Pack 2.
Fighter Pack 1 launched this summer and is $19.99; Fighter Pack 2’s price hasn’t been announced yet. The Ultimate Pack is $39.99, and it encompasses the post-release DLC characters and other cosmetic items.
For more on Injustice 2, read Polygon's review.