Star Trek: The Next Generation - Season 1 Episode 22 -

The shuttle bringing Troi back to the Enterprise from an individual mission crashes on a near-unknown planet. It was presumed uninhabited, but shows atypical, life-like activity. Riker leads an away-team, including Data, which discovers the shuttle is controlled and access barred by a shape-shifting, oily slick of hostile, almost sadistic nature, with immense powers. Attempts to pass it cause Riker to be temporarily swallowed, Yar to be killed. Picard beams down to take command while Deana works out it's acting out of deep frustration, which they must tap into.