The Dark Knight's biggest challenge yet awaits in the DCU's Batman reboot, The Brave and the Bold, and it isn't a supervillain. Batman's ability to go toe-to-toe with godlike entities like Superman, despite having nothing but mortal brains, brawn, and inordinate wealth on his side, is part of what makes him one of DC's most compelling superheroes. Batman's proficiency in planning for every eventuality, however, does not preclude him from facing the same challenges that any mortal can face, especially when it comes to his nearly unassailable strength of will.

https://screenrant.com/batman-no-kill-rule-brave-and-bold-challenge/