Lost Imp was a mission on Spineworld.
Go to the Transit Bar and talk to Gir-Dir. He said that Night Star came in quickly and disappeared to the Bongo Camp. Talk to Ma Bongo at Bongo Camp and she will say that she isn't sure, but they could take a look in the Bongo Excavation. Go down to the Bongo Excavation and Night Star is there. He says he is okay. Go back and tell Gold Sparkle that Night Star is okay.