The Stranger Things community has no shortage of intriguing fan theories, but perhaps one of the most fascinating of all concerns Eleven and 001, otherwise known as Vecna. Stranger Things Season 4 explores Vecna's backstory in detail, showing how he developed psychokinetic abilities as a young child and attracted the attention of Dr. Martin Brenner, AKA Papa. Henry Creel was designated '001' by Hawkins Lab, becoming Papa's first-ever child test subject. As time passed, Henry grew up to become one of the orderlies under Brenner's watch, which is how he met young Eleven. But one fan theory suggests that 001 and 011 have a more complex past, specifically hinting that the pair are relatives.