Starro

After that fateful day against Starro, Batman would never go back to his isolation.

His character was killed off in the latter, as John Cena's Peacemaker was under orders from Amanda Waller to keep the U.S. government's role in bringing Starro to Earth under wraps, by any means necessary.

During the storyline, Starro gave his life to make sure that the Omega Titans could not end all life.

Is it the inscrutable Starro or the devious Despero?

Starro is an alien amalgamate conqueror with a humanoid central mind commanding spores which can generate clones that act to his will.

Starro's most troublesome abilities is his mind control - able to telepathically manipulate even the strong-willed members of the Justice League.

What choice would Waller have but to then assemble Suicide Squad to take down Starro and investigate the fate of the first team?