The Human Torch - Captain America: The First Avenger
Those unfamiliar with comics hear the name "Human Torch" and immediately think of the Fantastic Four's Johnny Storm, but readers know that Johnny's actually the second being to take up that mantle.
The original Human Torch showed up in 1939's Marvel Comics #1 from Timely Publications. The original Torch is actually an android whose creator placed him in a big glass case. When the case opens, the exposure to oxygen causes the android to catch fire (and, interestingly, gain sentience). The Human Torch became one of Marvel's first characters, and even did battle with Namor the Sub-Mariner.
The Human Torch shows up briefly during Captain America: The First Avenger, on display during the Stark Expo near the beginning of the film. That means that the movie actually has two former Human Torches in it, with Chris Evans being the second.