Spoilers are precisely defined here. Rules vary by the story's medium. Info from television stories can't be added here until after the top or bottom of the hour, British time, closest to the end credits roll on BBC One. Therefore, fans in the Americas who are sensitive to spoilers should avoid Tardis on Sundays until they've seen the episode.
The seas of planet Earth are choked by plastic. Plastic that no-one has a use for and no-one can get rid of.
Rhys Williams finds himself stranded on a container ship in a sea of debris. People on board are dying. Because, luckily, someone's found a solution to Earth's polluted waters. The Nestene Consciousness can never have too much plastic.
For the purposes of this list, an "Auton story" is one in which one living, authentic Auton plays a part within the confines of the story, outside of flashbacks to previous stories and cliffhangers that lead into the following story. For this reason, stories such as Love & Monsters are absent due to the Autons' only contribution being references to past Auton stories.