The FGC 47 lifeforms were territorial non-corporeal beings that lived in the FGC 47 nebula. They fed on the dense web of plasma energy strands found within. When the USS Enterprise-D investigated the nebula in 2368, the lifeforms viewed the Enterprise's energy systems as far purer than those normally present in the nebula on which they "fed." One of the beings manifested as Isabella, the imaginary friend of Clara Sutter, one of the children aboard the ship. (TNG: "Imaginary Friend" )