Challengers of the Unknown #75

The cover of this September 1970 DC issue says it all — a massive blue robot called Ultivac dominates the scene, hurled or toppling through the air while members of the Challengers scramble and fight across a chaotic, debris-strewn foreground. A mysterious figure in purple looks on from the left, and the bold tagline "Ultivac Is Loose!" makes clear this is no ordinary threat facing our team of daring adventurers. With cover work by Jack Kirby and George Tuska, and interior scripting and art from the Kirby camp, Challengers of the Unknown #75 promises a wild ride through the kinds of high-stakes, larger-than-life dangers the series does best.