This module provides a means of creating a URL alias in a Drupal site that points to an external location (although it could be internal). It allows the alias to be redefined which means it can be set to point to a different location at some time, either temporarily or permanently.

The check for, and redirection of, an AlienAlias is performed early in the boot-up sequence of Drupal by default, which means it has minimal impact on resource usage - compared to having to fully boot-up Drupal before being able to redirect. (This is optional on a per-alias basis, or globally.)