Thor 4 is officially happening, which makes it Marvel's longest-running series to date.
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Although Thor's story seemed to conclude with other MCU heroes in Avengers: Endgame, he's coming back in Phase 4.
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Taika Waititi, who directed Thor: Ragnarok, is returning to helm the fourth movie.
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Because Thor 4 is happening now, it'll release in the 2020s. That makes it the longest-running series, since it began in 2011.
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Iron Man, on the other hand, started in 2008 and ended in 2013.
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Captain America began his solo series in 2011 and ended in 2016.
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Meanwhile, Hulk hasn't had a solo movie since 2008.
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