Co-writers Leah Moore & John Reppion take “2000 AD” back to 800 AD this July for supernatural Viking tale “Black Shuck.” Featuring “Zenith” co-creator Steve Yeowell on art, “Black Shuck” is Moore and Reppion’s first contribution to “2000 AD” proper, although the married duo wrote “Scouting for Bots,“ a one-off short for “2000 AD” sister publication “Judge Dredd Megazine” last year.