After the conclusion of "The Life and Death of Johnny Alpha", the series returned to its bounty-hunter premise. In "The Son" in 2018 a new character, Wulf Sternhammer's son Kenton, joined Johnny Alpha as a rookie Search/Destroy agent. Since the death of artist Carlos Ezquerra in October 2018, the editor of "2000AD", Matt Smith, has said he is yet to decide whether the series should continue without Ezquerra. However he has said that spin off series set around popular supporting characters are in development. A story starring the Stix Clan was later published in the May 2019 "Villains Takeover Special". In 2020 a one-episode story about Johnny Alpha as a child appeared in prog 2183, by Michael Carroll and Nick Brokenshire. Johnny Alpha has also appeared in three "Judge Dredd" stories, in which he travelled back in time to Dredd's era. The first was "Top Dogs", written by John Wagner, which appeared in the "Judge Dredd Annual 1991" (published in 1990). The second was "Judgement Day", a 20-episode story written by Garth Ennis, which appeared in both "2000 AD" and in the "Judge Dredd Megazine" in 1992. The third was "By Private Contract" in issue 2000 of "2000 AD" in September 2016, also written by Wagner. He also stars with Judge Dredd in the Big Finish audio book "Pre-Emptive Revenge", in their attempt to stop a nuclear dirty bomb from launching while trying to reach safety after a successful co-operative mission. In 1987, Titan Books produced the first collected volume of Strontium Dog stories and others have appeared piecemeal over the years. Starting in 2007, Rebellion Developments released a complete run of collected Strontium Dog stories as the "Search/Destroy Agency Files". In 2008 Rebellion also began reprinting the new series of stories. Most of the post-Final Solution 'Strontium Dogs' stories were collected in softback collections bagged with issues of the "Judge Dredd Megazine". All material from "Max Quirxx" to "Journey into Hell" written by John Wagner and illustrated by Carlos Ezquerra unless otherwise stated. All stories thereafter written by John Wagner and Alan Grant writing in partnership unless otherwise stated. All stories written by John Wagner and illustrated by Carlos Ezquerra, except where otherwise indicated. Ezquerra's son Hector joined as inker and colourer for the stories from "Blood Moon" to "The Project".