Batmans son

Nicholas Wayne is Nightwing. After his girlfriend is fatally injured he joins Young Justice. They face a time/dimension traveling menace, and a war with the one person that you don't want to deal with, Doomsday.

After Infinity War

All the survivors of Infinity War are figuring out what has happened and are coming up with their new plan to fight Thanos and bring back those they lost. Completed, with a sequel on the works.