 For example, "Top Dog" was followed up by "Judgement Day," and the reference to "Flesh" in "Judge Dredd" was reciprocated by the cameo appearance of a Mega-City judge in "Nemesis the Warlock Book V," which was itself a crossover with "Flesh" because it featured Satanus in a major role.This latter example illustrates how series were not just linked to each other in pairs, but in multitudes.Pat Mills, the first editor of "2000 AD" and creator of many enduring series, was responsible for many such connections.