Ed and the crew change Apollo 15's landing site after lunar ice is detected.

A launchpad accident leads to delayed missions and FBI background checks.

The rivalry between American astronauts and Soviet cosmonauts intensifies as last-minute changes impact the Pathfinder mission plan.

Tensions between the U.S. and the Soviet Union reach an all-time high on the moon, throwing multiple missions into jeopardy.

Things start to go awry just as an important mission approaches a critical juncture.

Tensions on Earth and Mars come to a head.