Given the fact that the time travel scenario in DC’s Legends of Tomorrow allows the series to use DC Comics characters from pretty much any era, it would feel like a natural place to bring the comic book character Sgt. Rock into live-action – and indeed, Rock’s introduction has been rumored before, only for it to not occur. However, Legends of Tomorrow executive producer Marc Guggenheim tells IGN they do indeed plan to bring in Sgt. Rock eventually.
Season 2 is introducing the Justice Society of America, World War II background included, and I asked Guggenheim if that could allow for Rock — traditionally depicted in DC Comics as a US World War II soldier — to make his debut as well.