So when Cavill stepped onto the stage for a panel with his "Immortals" co-stars, producers and director on Saturday, the audience was hoping for a morsel of "Man of Steel" -- as well as some "Immortals."
"Immortals," about the Greek warrior Theseus and the evil King Hyperion, drew massive interest at Comic-Con. In addition to Cavill, it has Frieda Pinto, Stephen Dorff, Luke Evans, Kellan Lutz and Mickey Rourke, and it's directed by Tarsem Singh.
The cast -- minus Rourke -- and Singh, along with producers Mark Canton and Gianni Nunnari, promoted the Relativity film in Comic-Con's giant Hall H on Saturday.
As Drew McWeeny writes in Hitfix, the 3D movie "looks like a painting, with the colors and textures of a Caravaggio, and with crazy bursts of hyperviolence. The gods here are young and beautiful, because as Tarsem put it, 'If you were immortal and could live forever, would you want to look like Henry Cavill, or would you want to look like Mark Canton?'"
Producers showed off a few film clips, including what TotalFilm called "an impressively muscular fight scene, in which Evans’ Zeus enters a cavernous keep and proceeds to slay numerous nasties."
But despite the intensity of "Immortals," Superman lurked.
In fact, reports Digital Spy's Morgan Jeffery, when the moderator opened the panel for questions from the audience, he reminded them to pose only "Immortals"-related questions.
"What ever could he mean?" Jeffery noted.
And Matt Goldberg, in Collider, wrote that he "wanted to see how many 'Man of Steel' questions Cavill could duck."
But the audience did as it was told. Even the guy wearing the Superman shirt asked an "Immortals" question.
Finally, with two minutes left to go in the panel, The Los Angeles Times reports, moderator Geoff Boucher asked a Superman question.
Cavill didn't give much:
"It's one of the best scripts I've ever read," he said. "I'm quite humbled by the whole experience, and can't wait to get started."
"Immortals" opens on Nov. 11.