The film picks up where The Avengers left off, with Tony Stark (Robert Downey Jr.), aka Iron Man, and Bruce Banner (Mark Ruffalo), aka the Hulk, experimenting with artificial intelligence. They create an artificial intelligence system, code-named "Ultron," which quickly becomes self-aware and decides that humanity is the problem. Ultron becomes hostile and decides to destroy humanity.

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Aunque en su estreno recibió críticas mixtas por la cantidad de subtramas que preparaban el terreno para futuras entregas, el tiempo ha tratado de forma excelente a La Era de Ultrón . Hoy se le reconoce como la semilla directa de Capitán América: Civil War (debido a los Acuerdos de Sokovia) y el preludio indispensable para la llegada de Thanos en Avengers: Infinity War .