Basil Wolverton's Planet of Terror #1

In 2423, a pacifist scientist confronts the united Earth government’s plan to attack peaceful Martians, arguing that their magnetic weapon must be tested on the moon. When the test fails to register, the ruler suspects deception—until the scientist reveals the blast shifted the moon’s orbit, sending it crashing into Earth. The resulting chaos shatters the moon, unleashing devastation that wipes out humanity. Left alone, the scientist believes his actions spared other worlds from Earth’s aggression.

In "The Monster On Mars," stranded Earthman Bob is pulled from his lonely existence on the red planet when a massive hand from Venus reaches out, summoning him to aid in a desperate battle against the Mercurians—sinister green humanoids with long limbs and a taste for conquest. After helping repel the invaders, the hand reveals itself as Princess Teba, a shapeshifter who appears as a stunning Earth woman and flees from a war-torn Venus. With her fate now tied to his, Bob faces an unexpected choice: stay on Mars or journey to a world he’s never seen, to help her defend her home.