This story was first produced as a radio play on the radio program "X Minus One" which aired on August 25, 1955.
This is the only episode of Season Three based on an existing work of literature, namely the 1954 short story "The Cold Equations" by Tom Godwin.
The amount of extra weight that computer detects as a stowaway, 43.369 kg is equal to 95.6122785 pounds.
Marilyn Lee Cross was born on July 7, 2040.