"Episode 6646", also known as "The Eclipse", is the 6646th episode of the Australian soap opera Neighbours. It premiered on Eleven on 20 May 2013. The episode was written by Jason Herbison and directed by Laurence Wilson. Episode 6646 revolves around an annular eclipse, which changes the lives of several Ramsay Street residents. It was first teased by executive producer Richard Jasek in January 2013. The episode saw several storylines play out with Kyle Canning sustaining serious damage to his eyesight, a child kidnapping, the introduction of a new family and the return of two former characters; Mark Brennan and Brad Willis.

Imogen Willis is a fictional character from the Australian soap opera Neighbours, played by Ariel Kaplan. The actor was cast in the role after a quick process, in which she auditioned once and attended a screen test. She began filming her first scenes in early February 2013. Kaplan's character and her family were created and introduced to Neighbours, as part of an ongoing overhaul of the show's cast and renewed focus on family units within the show. She made her first screen appearance during "Episode 6646", which was broadcast on 20 May 2013. Kaplan returned in the first episode of the 2023 Neighbours revival.