Captain America: The First AvengerSave

We open in present-day Arctic, where a team of scientists discovers a frozen circular shield embedded in the wing of a buried 1940s aircraft. They radio in: 'Better tell the Colonel.' Then jump cut to: Brooklyn, 1942. Steve Rogers is a 90-pound asthmatic with bad hearing, bad eyesight, and a bad heart, repeatedly rejected by every military recruitment center he visits. He has tried five times to enlist. His best friend James 'Bucky' Barnes has just shipped out with the 107th Infantry. Steve attends a science exhibition and confides in a mysterious German émigré scientist named Dr. Abraham Erskine.

Erskine sees something in Steve. He recruits him for an experimental Strategic Scientific Reserve program — Project Rebirth — to create a super-soldier. Steve trains under Colonel Chester Phillips and British agent Peggy Carter (Hayley Atwell, in the role that would become a fan-favorite). The other candidates are physically stronger; Steve keeps proving his moral worth (jumping on a dummy grenade, organizing his squad in adverse conditions). Erskine selects Steve for the procedure: 'A weak man knows the value of strength. He knows the value of compassion.'

The procedure transforms Steve into a 6'2" super-soldier. Moments later, a HYDRA spy (Heinz Kruger) assassinates Erskine and destroys the remaining serum vials before being killed. Steve chases Kruger through Brooklyn streets — still in his stretched-out civilian shirt and laboratory undershorts — and saves a child from a burning car (the iconic 'I can swim' beat). The serum is irreplaceable. Steve is the only super-soldier ever created using the original formula.

The military doesn't quite know what to do with Steve. He's assigned to a USO tour promoting war bonds — performing on stage in a costumed showbiz version of Captain America, punching cardboard cutouts of Hitler. He hates it. While performing in Italy near the European theater, he learns that Bucky's regiment — the 107th — has been captured by HYDRA. Phillips writes them off as casualties. Steve, with Peggy's help and Howard Stark's flight equipment, single-handedly infiltrates the HYDRA base and rescues 400 American POWs.

Steve assembles the Howling Commandos — a multinational unit including Bucky (rescued from HYDRA) — and spends the next year demolishing HYDRA bases across Europe. Their final target: a HYDRA train carrying weapons. Bucky is knocked from the train mid-fight by HYDRA gunfire and falls into a deep mountain ravine. Steve, unable to reach him, presumes Bucky dead. The death will define the franchise. Steve eventually corners Red Skull on a HYDRA aircraft carrying the Tesseract — a Cosmic Cube of unknown energy — toward New York City for a final attack.

Steve crashes the plane into the Arctic to prevent the strike. Red Skull is consumed by the Tesseract's energy (apparently disintegrated; later revealed in Infinity War as banished to the Soul Stone's guardian role). Steve crashes the plane into the ice. He radios Peggy from the cockpit, promising her he'll take her dancing when he gets back. He never does. He goes under the ice and stays there for 70 years.

The film closes with Steve waking up in a 1940s-themed recovery room in Manhattan — a Nick Fury cover operation to ease him into the modern world. He notices the baseball game playing on the radio is from 1941. He sees a fly in plastic glass. He recognizes he's not in his own time and bolts. He runs out into Times Square, 2011, surrounded by neon and confused. Nick Fury arrives and tells him: 'You've been asleep for almost 70 years.' Steve looks at the camera and says: 'I had a date.'

The First Avenger grossed $370 million globally on a $140 million budget — modest by MCU standards but pivotal for the franchise. It established Steve's character, the Howling Commandos, Peggy Carter (who anchored Marvel's Agent Carter Disney+ series for two seasons), the Tesseract as the future Loki MacGuffin, and the WWII-era HYDRA infrastructure that would resurface throughout Phase Two. Joe Johnston's 1940s-period direction made it the rare MCU film that feels visually distinct from the rest of the franchise — a deliberately old-Hollywood register that subsequent Captain America films would never quite repeat.