In the Star Trek episode “And the Children Shall Lead”, an alien entity that is trying to conquer the galaxy tried to get children to take over the Enterprise to go to Marcos 12 where it had “millions of friends”.
Kirk de-programs the children by showing them images of their dead parents and the Gorgan disappears. Sulu says that they are approaching Marcos 12, but Kirk tells him to redirect to Star Base 4.
Why did Kirk just leave? Why didn’t he go to Marcos 12 to find out what was there? It seems logical that if the creature had some sort of army there, Kirk should have investigated or at least sent word to the Federation to investigate, not simply leave as though everything is fine and dandy now that the one creature appears to be gone.