Agent X replaced Deadpool with a similar protagonist, while including ambiguous hints as to the nature of his relationship with the original character. "Agent X" was well received by critics but wasn't a sales success. Some felt this title suffered due to Marvel's lack of support for both this and Soldier X as neither title enjoyed house or trade support. Simone publicly clashed with Marvel's editorial staff as the relaunched title struggled to find a foothold. Simone left the book after issue 7, with the protagonist's true identity still unrevealed.