The Star Poet is a Butterfly Person who travelled the universe.
The Star Poet arrived on Earth and was lost and so located Sarah Jane Smith who gave it directions back home to Arcateen 5. In return the Star Poet gave Sarah Jane a communicator with which Sarah Jane could contact her for help with her poetry. Maria Jackson saw Sarah Jane with the Star Poet in her garden. This was the first alien she ever saw. (SJA: Invasion of the Bane).
Sarah Jane Smith later told Maria Jackson her name and gives her box which Maria Jackson should only use in an emergency. (SJA: Whatever Happened to Sarah Jane?) The Star Poet had also given Sarah Jane a warp star on a chain, with which she later (with Jack Harkness' assistance) threatened to destroy the Dalek's Crucible. (DW: Journey's End)