Iron Man 3 (2013)
Stark has panic attacks and builds forty-two suits he doesn't need. A terrorist called the Mandarin bombs targets across America. The reveal: "the Mandarin" is an actor, Trevor Slattery, hired as a front by Aldrich Killian, who runs a regenerative treatment called Extremis that makes subjects explode when it fails.
Stark destroys his armours and has the shrapnel removed. It doesn't last, but the intent — to be a person rather than a weapons platform — is the arc.
The Mandarin plot, properly explained — because it's spread across two films eight years apart and almost nobody gets it first time.
Layer 1 — the con. Killian's Extremis subjects sometimes explode. To hide the failures, he invents a terrorist called the Mandarin and claims the explosions as bombings. He hires Trevor Slattery, a washed-up British actor with a drug habit, to perform the role on video. Slattery has no idea what's actually happening — he thinks he's landed a great gig with good catering.
Layer 2 — the theft. The name "the Mandarin" was never Killian's invention. It was one of many names accumulated over a thousand years by the very real Xu Wenwu, who runs the very real Ten Rings organisation. Killian stole a living man's identity for his cover story.
Layer 3 — the consequence. The real Ten Rings were, understandably, furious. They abduct Slattery and keep him alive as a court jester rather than executing him. He resurfaces in Shang-Chi (film, 2021) living in Wenwu's compound, and again in Wonder Man (series, 2026) as a free man after a decade inside.
So: Iron Man 3's villain is a con man impersonating a man who was alive, powerful, and extremely annoyed about it.
Thor: The Dark World (2013)
Jane Foster is infected by the Aether (the Reality Stone). Malekith the Dark Elf wakes to claim it. Frigga, Thor's mother, is killed. Thor and Loki reluctantly ally; Loki fakes his own death, then secretly deposes Odin and rules Asgard disguised as him.
The Aether is handed to the Collector for safekeeping, since keeping two Stones in one place is unwise. Thanos will take it from him.
Who is the Collector? Taneleer Tivan, one of the oldest beings in existence — an Elder of the Universe, and brother to the Grandmaster you'll meet in Ragnarok. He collects rare species and artefacts on Knowhere, a mining colony built inside a severed Celestial head. He appears here, in Guardians of the Galaxy (film), and in Infinity War (film).
He does not support Thanos. He accepted the Aether for safekeeping fully intending to add it to his collection, which is exactly what a collector would do.
Thanos takes it by force — and the scene the audience watches of Thanos torturing him is an illusion. Thanos already had the Stone, and had already killed him.
Captain America: The Winter Soldier (2014)
The most consequential film of Phase Two. Rogers discovers that HYDRA never died — Arnim Zola's postwar recruitment programme grew inside S.H.I.E.L.D. for seventy years. S.H.I.E.L.D.'s Project Insight, three helicarriers with algorithmic targeting, was built to pre-emptively kill millions of people HYDRA considered future threats.
Rogers, Romanoff, and Sam Wilson (Falcon) destroy the helicarriers and dump every S.H.I.E.L.D. and HYDRA file onto the public internet. S.H.I.E.L.D. ceases to exist. Fury goes underground.
The enforcer sent to stop them is the Winter Soldier — Bucky Barnes, alive, kept in cryogenic storage between missions and repeatedly mind-wiped for seventy years. He half-recognises Rogers, pulls him from the river, and disappears.
Why dump the files publicly rather than clean house? Because HYDRA isn't a faction inside S.H.I.E.L.D. — it is S.H.I.E.L.D., woven through every level over seventy years. There is no clean way to separate them, no uncompromised authority to report to, and no time.
Natasha's reasoning is that exposing HYDRA means exposing S.H.I.E.L.D., because they're the same organism — and that means burning every cover identity and operation she has ever run. She does it in front of a Senate committee anyway.
The cost is that every intelligence agency on Earth now holds S.H.I.E.L.D.'s files, which is a large part of why the world is so hostile to enhanced people by Civil War.
Why this film matters structurally: with no S.H.I.E.L.D., there is no oversight body, no institutional glue, and no adults in the room. Every subsequent crisis — Ultron, the Sokovia Accords, Ross's presidency — flows from the vacuum this film creates.
Guardians of the Galaxy (2014) and Vol. 2 (2014)
Peter Quill steals an Orb containing the Power Stone. Pursued for it, he ends up in a prison with Gamora (Thanos's adopted daughter, defecting), Drax (whose family Thanos's forces killed), Rocket (a genetically and cybernetically tortured raccoon), and Groot (a tree). They escape, sell out, un-sell out, and stop the Kree fanatic Ronan the Accuser from using the Stone to destroy Xandar. Groot dies saving them and regrows from a cutting as Baby Groot. The Stone is left with the Nova Corps.
Vol. 2: Quill's father Ego finds him. Ego is a Celestial who seeded thousands of planets with his own matter, intending to consume all life in the galaxy and remake it as himself; he needs a child with Celestial genes to power the process. He also murdered Quill's mother. Quill kills him. Yondu — who kidnapped Quill but raised him, and refused to hand him over knowing Ego killed his other children — dies saving him. "He may have been your father, boy, but he wasn't your daddy."
She becomes a genuine member from Infinity War onward, and by Endgame she is structurally central to the plot.
On the Power Stone: the Guardians hand it to the Nova Corps because they have safe containment and legitimate authority, and because the Guardians at that point are four criminals and a tree.
It fails. Between films, Thanos attacks Xandar and takes it offscreen; a news report early in Infinity War is the only acknowledgement.
Xandar is destroyed.
Avengers: Age of Ultron (2015)
Ultron recruits twins Wanda and Pietro Maximoff — Sokovian volunteers experimented on by HYDRA with the Mind Stone, giving Wanda reality-warping abilities and Pietro superspeed.
How Vision is actually created, and why. Ultron wants a body of organic-synthetic tissue — vibranium plus a regeneration "cradle" — so he can be indestructible. The Avengers steal it mid-upload. Stark and Banner want to put J.A.R.V.I.S. in it; Rogers objects violently, having just watched them create Ultron by exactly this method. Thor settles the argument by striking the cradle with lightning.
Where did the Mind Stone come from originally? Never explained on screen.
Ultron lifts the city of Sokovia into the sky to drop it as an extinction meteor. The Avengers evacuate and destroy it. Pietro Maximoff dies. Thousands of Sokovian civilians die in the collateral damage. That civilian death toll becomes the direct legal justification for the Sokovia Accords.
The team splinters. Thor leaves to investigate the Stones. Stark steps back. Rogers and Romanoff train a new roster: Wilson, Rhodes, Wanda, Vision.
Hulk flies a Quinjet into deep space to remove himself as a threat, crashes on Sakaar, and spends two years there as a gladiator, never once turning back into Banner. He's next seen in Thor: Ragnarok (film, 2017). He misses the Accords entirely.
Hawkeye retires to his hidden farm with Laura and their children. He is in Civil War — Rogers calls him out of retirement to break Wanda out of the compound — but he's imprisoned on the Raft, then takes a plea deal and house arrest, which is why he's absent from Infinity War.
Ant-Man (2015)
Scott Lang, a burglar fresh out of prison, is recruited by Hank Pym to steal a shrinking suit before Pym's protégé Darren Cross can weaponise the technology. Lang succeeds, goes subatomic to sabotage Cross, and — critically — returns from the Quantum Realm, which Pym had believed impossible. That single fact is the seed of Endgame's entire solution.
The street-level track: Netflix, 2015–2019
Running parallel, mostly in Hell's Kitchen, with a completely different tone: grounded, violent, legally messy. For years these were treated as semi-canon. They are now canon, and directly load-bearing.
Daredevil, Seasons 1–3 (2015–2018) Matt Murdock, blinded as a child by a chemical spill that hyper-enhanced his remaining senses, is a Catholic defence lawyer by day and a vigilante by night. His firm partner is Foggy Nelson; their secretary-turned-investigator is Karen Page.
His nemesis is Wilson Fisk, the Kingpin — a crime lord with genuine ambitions of civic improvement and an inability to be anything but a monster. Season 2 introduces Frank Castle, whose family was murdered in a botched operation and who responds by killing criminals rather than arresting them, and Elektra Natchios, tangled up with a shadowy organisation called the Hand. Season 3 introduces Benjamin "Dex" Poindexter — Bullseye — an FBI sharpshooter with a severe personality disorder and perfect aim, who Fisk identifies and manipulates into becoming a weapon.
Also from Season 1: Vanessa, an art dealer Fisk falls in love with. She begins as his humanising influence and ends as co-architect of his empire — and it is Vanessa who orders Foggy Nelson's murder years later, revealed in a flashback in Born Again.
The Hand — an ancient cult of ninjas, central to Daredevil Seasons 2–3 and The Defenders. Five immortals extending their lives through a resurrection process requiring human sacrifice; they resurrect Elektra as their weapon, "the Black Sky."
They have no current relevance. They were the Netflix era's central mythology and Born Again hasn't brought them back.
Jessica Jones, Season 1 (2015) A superpowered private investigator with PTSD and alcoholism, hunted by Kilgrave, a man whose voice compels absolute obedience and who once controlled her for months. She kills him. It's one of the best things Marvel has made about coercion and its aftermath.
The Punisher, Seasons 1–2 (2017, 2019) Frank Castle uncovers the military conspiracy behind his family's murder. Extremely violent, largely disconnected from the wider universe — which is the point.
Also in this bracket, and optional: Luke Cage, Iron Fist, The Defenders, and Jessica Jones Seasons 2–3.
The Defenders (series, 2017) is where Jessica Jones first meets Matt Murdock — she, Matt, Luke Cage, and Danny Rand team up against the Hand, and she is memorably unimpressed by all three of them. She returns as Matt's ally in Born Again Season 2.
Why these matter now: Daredevil: Born Again is a direct continuation, its second season crosses over with Spider-Man: Brand New Day, and Charlie Cox's Matt Murdock is confirmed for Avengers: Doomsday.
The other TV shows
Agents of S.H.I.E.L.D. (7 seasons), Agent Carter, Inhumans, Runaways, Cloak & Dagger, Helstrom.
Season 1 of Agents of S.H.I.E.L.D. is a genuinely good companion to The Winter Soldier — the show's status quo collapses at the same moment the film's does. Everything after that drifts into its own continuity that later films don't acknowledge. None of it is required.