Warning: Spoilers for the Legends of Tomorrow season 7 finale.
Nate has bid farewell to Legends of Tomorrow at the end of season 7, but that may have come at the cost of creating a curious plot hole regarding the character's background. Legends of Tomorrow season 7 concluded with fewer episodes than previous ones, and the show is now awaiting confirmation on whether it will return for season 8. While the Legends of Tomorrow writers didn't know if it would get another season or not, they decided to end the season on a major cliffhanger in the season 7 finale «Knocked Down, Knocked Up.» The Legends are now under arrest for their crimes against time and will no longer be able to count on Nate Heywood, a.k.a Steel, to help them.
Between the final battle against evil Gideon and the surprising reveal of Booster Gold, Legends of Tomorrow saw its long-time cast member Nick Zano make his last appearance as a series regular. Zano had joined the cast of Legends of Tomorrow during season 2 and to this day had been one of the show's most important characters. Introduced as a historian with a particular interest in the Legends, Nate evolved into a superhero after having a serum injected into his bloodstream by Ray Palmer. Nate would eventually follow in the footsteps of his grandfather, the Justice Society member Commander Steel.
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In addition to his connection to a hero from DC's Justice Society, another important element of Nate's background was the fact that he was a hemophiliac. By his parents' decision in an attempt to protect him, Nate was never allowed to go outside and ended up dedicating all his time to his studies and his Indiana Jones
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