"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.

Kyle Canning is a fictional character from the Australian soap opera Neighbours, played by Chris Milligan. The actor successfully auditioned for the six-week recurring role of Kyle and he made his first on screen appearance on 26 November 2008. Milligan was later asked back every couple of months to do a few weeks filming. After eighteen months of playing Kyle on a part-time basis, Milligan was given a full-time contract deal and he and his character were promoted to the regular cast. Milligan said he was ecstatic about his promotion and looked forward to developing his character further. In August 2011, Milligan had to be written out of Neighbours temporarily so he could recover from an injury he sustained off screen.