13 Characters Who Are Nearly Identical in DC and the Marvel Cinematic Universes

Meanwhile, Deadpool (Ryan Reynolds) is also subject to inhumane experiments. They cause his body to be constantly fighting off his cancer, and his physical appearance is altered forever. Like Deathstroke, he's nearly unstoppable, and also like Deathstroke, he's a mercenary.

Who was created first? Deathstroke first appeared in the comics in 1980, while Deadpool came along a decade later in 1990.