Secret Invasion is an American television miniseries created by Kyle Bradstreet for the streaming service Disney+, based on the 2008 Marvel Comics storyline of the same name. It is the ninth television series in the Marvel Cinematic Universe (MCU) produced by Marvel Studios, sharing continuity with the films of the franchise. It follows Nick Fury and Talos as they uncover a conspiracy by a group of shapeshifting Skrulls to conquer Earth. Bradstreet serves as the head writer, with Ali Selim directing.

Samuel L. Jackson and Ben Mendelsohn reprise their respective roles as Fury and Talos from previous MCU media, with Kingsley Ben-Adir, Killian Scott, Samuel Adewunmi, Dermot Mulroney, Richard Dormer, Emilia Clarke, Olivia Colman, Don Cheadle, Charlayne Woodard, Christopher McDonald, and Katie Finneran also starring. Development on the series began by September 2020, with Bradstreet and Jackson attached. The title and premise of the series, along with Mendelsohn's return, were revealed that December. Additional casting occurred throughout March and April 2021, followed by the hiring of Selim and Thomas Bezucha that May to direct the series. Filming began in London by September 2021 and wrapped in late April 2022, with additional filming around England. During production, much of the series' creative team was replaced, with Brian Tucker taking over as writer from Bradstreet and Bezucha exiting, and extensive reshoots took place from mid-June to late September 2022.

Secret Invasion premiered on June 21, 2023, and ran for six episodes until July 26. It is the first series in Phase Five of the MCU. The series received mixed reviews from critics, who praised Jackson's and Mendelsohn's performances but criticized the writing (particularly that of the finale), pacing, and visual effects.

Nick Fury works with Talos, a shapeshifting alien Skrull, to uncover a conspiracy by a group of renegade Skrulls led by Gravik who plan to gain control of Earth by posing as different humans around the world.

Reprising their MCU roles are Cobie Smulders as Maria Hill, Martin Freeman as Everett K. Ross, and O-T Fagbenle as Rick Mason. The first episode reveals that Ross had been replaced by a Skrull infiltrator, and also features Hill's death. Smulders had been aware of the character's death during her initial discussions to join the series. Tony Curran appears as Derrik Weatherby, the director of MI6 who was replaced by a Skrull. Curran previously portrayed Bor in Thor: The Dark World (2013) and Finn Cooley in the second season of Daredevil (2016). Also appearing are Ben Peel as Brogan, a rebel Skrull who is tortured by Falsworth; Seeta Indrani as Shirley Sagar, Christopher Goh as Jack Hyuk-Bin, Giampiero Judica as NATO Secretary General Sergio Caspani, and Anna Madeley as the UK prime minister Pamela Lawton, all members of the Skrull Council; Juliet Stevenson as Maria Hill's mother Elizabeth; and Charlotte Baker and Kate Braithwaite as Soren, the wife of Talos and mother of G'iah who was killed by Gravik; Baker portrays Soren's human disguise while Braithwaite portrays her Skrull appearance. Soren was previously portrayed by Sharon Blynn in Captain Marvel and Spider-Man: Far From Home (2019).

In September 2020, Kyle Bradstreet was revealed to be developing a television series for the streaming service Disney+ centered on the Marvel Comics character Nick Fury. The character had previously been one of ten properties announced in September 2005 by Marvel Entertainment chairman and CEO Avi Arad as being developed for film by the newly formed studio Marvel Studios, after Marvel received financing to produce the slate of films to be distributed by Paramount Pictures; Andrew W. Marlowe was hired to write a script for a Nick Fury film in April 2006. In April 2019, after Samuel L. Jackson had portrayed Nick Fury in ten Marvel Cinematic Universe (MCU) films as well as the Marvel Television series Agents of S.H.I.E.L.D., Richard Newby from The Hollywood Reporter felt it was time the character received his own film, calling the character "the MCU's most powerful asset yet to be fully untapped". Jackson was attached to reprise his role in Bradstreet's series, with the latter writing and serving as executive producer.

In December 2020, Marvel Studios President Kevin Feige officially announced a new series titled Secret Invasion, with Jackson co-starring with Ben Mendelsohn in his MCU role of Talos. The series is based on the 2008–09 comic book storyline of the same name, with Feige describing it as a "crossover event series" that would tie-in with future MCU films; the series' official premise further described it as a crossover event series. Marvel Studios chose to make a Secret Invasion series instead of a film because it allowed them to do something different than they had done before. Bradstreet had worked on scripts for the series for about a year, before he was replaced with Brian Tucker. Directors were being lined up by April 2021. Thomas Bezucha and Ali Selim were attached to direct the series a month later, with each expected to direct three episodes and work on the story. However, Bezucha left the series during production because of scheduling conflicts with reshoots, and Selim ultimately directed all six episodes. The series reportedly went through multiple issues during pre-production, which necessitated Marvel Studios' executive Jonathan Schwartz becoming more involved with the series to get it "back on track" as it had fallen behind schedule and risked some actors becoming unavailable due to other commitments. The episodes were described as being an hour-long each, with the series ultimately totaling approximately 4.5 hours. Marvel Studios' Feige, Louis D'Esposito, Victoria Alonso, Brad Winderbaum, and Schwartz served as executive producers on the series alongside Jackson, Selim, Bradstreet, and Tucker. The budget for the series was $211.6 million. This was noted for being a large budget compared to the content in the series, which did not use large action set pieces or extensive visual effects. Extensive reshoots were believed to partially be the reason for the large budget.

Bradstreet, Tucker, Brant Englestein, Roxanne Paredes, and Michael Bhim served as writers on the series. Tucker received the majority of writing credits on the episodes. Feige said the series would not be looking to match the scope of the Secret Invasion comic book storyline, in terms of the number of characters featured or the impact on the wider universe, considering the comic book featured more characters than the crossover film Avengers: Endgame (2019). Instead, he described Secret Invasion as a showcase for Jackson and Mendelsohn that would explore the political paranoia elements of the Secret Invasion comic series "that was great with the twists and turns that that took". The creatives were also inspired by the Cold War-era espionage novels of John le Carré, the television series Homeland (2011–2020) and The Americans (2013–2018), and the film The Third Man (1949). Selim said the series transitions at times between espionage noir and a Western, highlighting the film The Searchers (1956) as a Western inspiration. Feige said the series would serve as a present-day follow-up to the 1990s story of Captain Marvel (2019), alongside that film's sequel The Marvels (2023), but was tonally different from the films. Jackson said the series would uncover some of the things that happened during the Blip. Cobie Smulders described the series as "a very grounded, on-this-earth drama" that was "dealing with real human issues and dealing with trust".