Possession: J.M. Dillard and Kathleen O'Malley

Star Trek Next Generation No. 40. Eighty years ago, bodiless entities brought a plague of violence and bloodshed to the planet Vulcan. The nightmare ended only when the entities were trapped inside special containers. Now on the eve of a galaxy-scale exposition, the containers have been opened, freeing the malevolent entities to possess the minds and bodies of all they encounter, including the crew of the Enterprise. Friends become foes and no-one can be trusted, as Captain Picard faces a deadly threat. Unless the entities can be stopped once more, they will spread their madness through the entire Federation.