The MCU has nailed most of its casting decisions, but that doesn't mean the studio hasn't taken risks with some of its choices. Many of the MCU's brightest stars have become Hollywood icons, but many of these actors were relatively unknown or experienced dips in their careers before becoming superheroes. Some actors were certified gold, such as Benedict Cumberbatch, Zoe Saldaña, or Samuel L. Jackson. These actors had already proven themselves before Marvel made them essential parts of the universe. Marvel is banking even more on proven talent, including Mahershala Ali, who is set to join the universe as Blade.