The story begins in an observatory, where an astronomer notices that Mars, older than Earth, has experienced a sudden drop off in sea levels and temperature. Its inhabitants seek a way off of their planet in order to survive these changes, and they achieve this by firing themselves off of Mars in canisters. From Earth, one only sees sudden explosions on the surface of Mars, but this fascinates the scientific community.
One canister lands near the narrator's home. It opens and a Martian comes out. It is nearly the size of a bear and greyish with large eyes and tentacles. The Martians dislike Earth’s atmosphere and retreat back into the canister. A human delegation, including the astronomer, approaches while waving the white flag of peace. The Martians vaporize the humans with a Heat Ray before continuing to assemble their machinery.