The Enterprise is transporting to the neutral planet Parliament peace delegates from two races which can't stand each other long enough to occupy neighboring suites, yet both want to join the Federation. Traveling trough a mysterious energy cloud, some gets aboard and keeps jumping from crew members to machinery and vice versa, as if seeking a suitable host and learning about the ship, without revealing itself. The crew catches on slowly, as nobody seems seriously affected, except Wesley's engineering mentor Singh, who is killed in a warp technology accident, but 'host' the highly intelligent entity.
Did You Know?
The original story by Michael Halperin
contained a different subplot involving a problem with the dilithium in the warp drive of the Enterprise. The diplomatic conference was added by D.C. Fontana
when it was developed into a teleplay. See more
When Geordi bends over Worf to check his pulse, the rubber outline of the makeup is clearly visible between his left eye and ear. See more
Captain Jean-Luc Picard
What the devil am I doing here?
Commander William T. Riker
Sounds like our Captain.
[after Picard has been beamed back out of the nebula
Star Trek: The Next Generation End Credits
Composed by Jerry Goldsmith
and Alexander Courage See more