Agent X is the relaunch of Deadpool. It has the same creative team and supporting cast, but possibly a totally different protagonist. Or possibly not. That's the plot, you see.
Agent X is an amnesiac with the letter X carved into his head in two places, the sort of character design which might be a little too literal, depending on what the reason turns out to be. He turns up at the doorstep of Deadpool's former secretary Sandi and asks her to help him to become a mercenary - a quest in which he is unfortunately marred by a near total lack of ability.