A mysterious (though temporary) vanishing of their various superpowers has the Justice League rattled! When a series of bizarre thefts begins, carried out using the pilfered powers of the League, can our heroes protect the next targets? The ingenious Professor Ivo makes his diabolical debut alongside his criminal creation, Amazo! (W) Gardner Fox (A) Mike Sekowsky, Bernard Sachs (CA) Mike Sekowsky, Murphy Anderson