Below's commanding lead stems from its October 8 all-episodes premiere, which quickly propelled the Josh Hartnett-led sea creature thriller to the top of U.S. Netflix charts and kept it there through mid-October. Strong critical reception, including an 87% Rotten Tomatoes score and generally favorable Metacritic marks, combined with timely spooky-season timing and word-of-mouth around its Newfoundland setting and creature-feature thrills, has sustained viewer engagement. Traders see limited realistic paths to an upset, though a major surge from new October 20 releases or an unusually sharp drop in Below's viewing minutes could shift the outcome before the weekly chart locks.