Premise: Concrete is a comic book series created and written by Paul Chadwick and published by Dark Horse Comics. His first appearance is "Dark Horse Presents" #1 (July, 1986). The eponymous central character is a normal man whose brain was transplanted into a large, stone body by aliens, and who lives an extraordinary life on Earth following his escape.
Hypothesis: The character in "Dark Horse Presents" successfully lived on Earth after escaping.