Justice League of America #173

TESTING OF A HERO! At Green Arrow's recommendation,  Black Lightning is considered as a prospective Justice League member but the other heroes disagree on his admittance. Meanwhile, a new super-villain surfaces in the person of The Regulator, a former research scientist who has the power to command armies of rats and other vermin. Unaware of the threat he poses, the Justice League continues with its test of Black Lightning's abilities. Disguised as villains, they battle him while Superman serves as judge of his initiation. Although he passes the test, Black Lightning declines to join the team, claiming prior responsibilities to his solo career.