who goes there?
A sentry's challenge to an intruder.
"Who Goes There?", about a group of Antarctic researchers who discover a crashed alien vessel, complete with a malevolent shape-changing occupant, was filmed as The Thing from Another World (1951), The Thing (1982), and again as The Thing (2011). Source: Internet
Three significant stories published under the pseudonym are "Twilight" (Astounding, November 1934), "Night" (Astounding, October 1935), and " Who Goes There? Source: Internet