Following the events of "Closure", Grant Ward's team find an ancient statue in the shape of the Hydra symbol on Maveth, the deserted planet opened through the Monolith.
Back on Earth, Alphonso "Mack" Mackenzie leads two teams into the castle to secure the portal and rescue Coulson, Fitz and Jemma Simmons, as well as Hydra's captive Inhumans, who have been brought in by Gideon Malick.
While Mack, Hunter and Morse seize the portal chamber, May finds Simmons and learns of Andrew's escape, and Joey saves Daisy from Giyera by melting three bullets, who is incapacitated by Lincoln.
His first-hand knowledge leads Fitz to realize that he is in fact the monster, inhabiting the reanimated body of Will, who actually died saving Simmons from it.
In November 2015, Marvel announced that the tenth episode of the season would be titled "Maveth", to be written by executive producer Jeffrey Bell, with Vincent Misiano directing.
[1] In November 2015, Marvel revealed that main cast members Clark Gregg, Ming-Na Wen, Brett Dalton, Chloe Bennet, Iain De Caestecker, Elizabeth Henstridge, Nick Blood, Adrianne Palicki, Henry Simmons, and Luke Mitchell would star as Phil Coulson, Melinda May, Grant Ward, Daisy Johnson, Leo Fitz, Jemma Simmons, Lance Hunter, Bobbi Morse, Alphonso "Mack" Mackenzie, and Lincoln Campbell, respectively.
[1] It was also revealed that the guest cast for the episode would include Blair Underwood as Andrew Garner, Constance Zimmer as Rosalind Price, Juan Pablo Raba as Joey Gutierrez, Powers Boothe as Gideon Malick, Mark Dacascos as Giyera, Garrett Hines as Hydra soldier and Brandon Ford Green as third soldier.
[6] Filming for the alien planet occurred in a work quarry in Simi Valley as well as around the Mojave Desert near Northridge, Los Angeles.