The Stars Are Also Fire

From introduction:

This adventure continues the story arc involving the escape of Aphoom-Zhah, son of Cthugha, from his prison in the Gamma
Leporis star system.

The physical form of the being that is Aphoom-Zhah, is still imprisoned in an alternate dimension, prevented escaping to our reality by the Elder Bonds of the temple on CS402 in the Gamma Leporis system. Part of its life force is currently possessing the mind of Psi Corps colonel Richards.

Using Richards as a conduit for it’s psychic energies, and with the help of an alien, extraterrene race known as the Xert, Aphoom-Zhah has taken control of the crew of a spaceship, the Cook, and travelled to the Fomalhaut Star
System, home of it’s father, the Great Old One Cthugha.