In the storyline Deadpool Kills the Marvel Universe, the X-Men send Deadpool to a mental hospital for therapy. The doctor treating him is actually Psycho-Man in disguise, who attempts to torture and brainwash Deadpool into becoming his personal minion. The procedure fails, but leaves Deadpool even more mentally unhinged; as a result, he kills Psycho-Man and begins assassinating every superhero and supervillain on Earth one by one in an attempt (apparently) to rebel against his comic book creators. The book ends with him breaking into the 'real' world and confronting the Marvel writers and artists who are currently writing the book. Before he proceeds to enter he turns to the reader, promising that once he's done with this universe, "I'll find you soon enough.
