Christy Marx served as head writer and story editor for the animated series "Jem and the Holograms" (1985-1988), creating the characters, storylines, and overall tone that defined the show. This became one of her most recognized and influential works, known for its strong female characters and integration of music into the narrative.

Marx also contributed to the writing of "G.I. Joe" during the 1980s, demonstrating her versatility in handling action-oriented storylines for a male-dominated audience. She contributed scripts that were known for their character depth and complex plots.

Details on her other animation work, including contributions to shows beyond "Jem" and "G.I. Joe", are not fully compiled. More research is needed to list all her animation writing credits.