You could have downloaded Excalibur: Morgana's Revenge 3.0 for Mac from our application library for free. The application is categorized as Games.
From the developer:
Excalibur: Morgana's Revenge is a unique scenario based upon the Aleph One (Marathon) engine. It is a first-person action adventure game, featuring an epic and in-depth story line.
As a Federation Marine resting after your last mission, you start aboard the exploration class Starship Kronos where you learn that your real mission has yet to begin.
You may want to check out more software for Mac, such as Spirit of Revenge: Gem Fury, Chicken Invaders 3- Revenge of the Yolk Easter Edition or Echoes of the Past: The Revenge of the Witch, which might be similar to Excalibur: Morgana's Revenge.
Adventure
Arcade