The Walking Dead will feature original comic book character, Mercer.Actor Michael James Shaw will portray the popular character, who is an officer of the Commonwealth and the de-facto leader of the Commonwealth Military in Robert Kirkman’s comics.Shaw, whose acting credits include playing Corvus Glaive in Avengers: Infinity War (2018) and Avengers: Endgame (2019), shared the news on Instagram, writing: “Super excited to announce that I will be joining @thewalkingdead for the final season as