Adlard began his work in the UK on White Death with Robbie Morrison and 2000 AD series including Judge Dredd, and Armitage.

[citation needed] In the United States he is best known for his work on The X-Files (for Topps), Astronauts in Trouble (for AiT/Planet Lar) and The Walking Dead[2] (for Image Comics).

[citation needed] He illustrated a graphic novel, Playing the Game, written by Nobel Prize winner Doris Lessing.

The one-shot was re-released as a limited edition in September 2008 through Ghostwriter Publications[citation needed].

In 2012, Adlard was one of several artists to illustrate a variant cover for Robert Kirkman's The Walking Dead #100, which was released 11 July at San Diego Comic-Con.