According to Nielsen Media Research, the episode was seen by an estimated 0.467 million household viewers and gained a 0.2 ratings share among adults aged 18–49.
Clark (Hamish Linklater), the Vermillion and more operatives arrive at the monastery with a giant tuning fork named "The Choke".
Back in the plughole, a monk takes Cary inside and Kerry decides to go after him while Lenny (Aubrey Plaza) stays above, having retrieved the weapon: a paintball gun.
In May 2018, it was reported that the tenth episode of the season would be titled "Chapter 18", and was to be directed by Dana Gonzales and written by series creator Noah Hawley and co-executive producer Nathaniel Halpern.
[1] In its original American broadcast, "Chapter 18" was seen by an estimated 0.467 million household viewers and gained a 0.2 ratings share among adults aged 18–49, according to Nielsen Media Research.
"[6] Beth Elderkin of Gizmodo wrote, "This week was supposed to be the Legion season finale, at least until an extra episode was tacked on last month.
"[7] Oliver Sava of Vulture gave the episode a 3 star rating out of 5 and wrote, "This story is more compelling when the threat comes from within David rather than an outside force.
"[8] Nick Harley of Den of Geek gave the episode a 3.5 star rating out of 5 and wrote, "As I said, strip away a lot of Legion's off-kilter imagery and some transparent attempts to infuse a little action into 'Chapter 18' and this episode is mainly used to for Syd and Melanie's back-and-forth and David’s dark turn, but those moments are genuinely gripping, well-acted stuff.
The site wrote, "Amid its surreal swirl of psychedelic visuals, FX's Legion delivers some powerhouse performances, too, and it was Jean Smart's turn to wow us this week, showing us a terrifyingly dark side to Melanie Bird.
Possessed by the Shadow King, Melanie served as a seductive devil on Syd’s shoulder, making her doubt her relationship with David and showing her the horrible things her mutant boyfriend is capable of.
Smart expertly transformed Melanie's own heartbreak over Oliver into a biting bitterness, calmly declaring that all men were not to be trusted — including David.