Singularity Aliens

From: Star Trek: The Next Generation

Caption: A Singularity Alien disguised as a Romulan.

Star Trek: The Next Generation

Episode: TNG 251 - Timescape

A species from another time continuum which can assume other forms and uses gravity wells as a nest for its young . Some mistook a Romulan warp core's artificial quantum singularity as a nest, sent the Warbird into distress, and then fractured time when the responding Galaxy-class Enterprise's power transfer beam locked on.