The Sandman: Overture is a comic book miniseries written by Neil Gaiman and illustrated by J.H. Williams III. It serves as a prequel to the original Sandman series and explores the events leading up to Dream's capture at the beginning of the series. The Sandman: Overture is praised for its stunning artwork and its expansion of the Sandman mythos. It provides new insights into the character of Dream and delves deeper into the world of dreams and storytelling.