They realised he would "match the idea and universe" of Anarchy Reigns, but there's "no direct continuity" in story or game world - only inspiration.
"We quite like Madworld as a game and also Jack as a character, so we always wanted to revisit them if we had the chance," said game designer Hirono Sato.
"When we first came up with the concept of Anarchy Reigns we realised that Jack would match the idea and universe quite well, so we decided to use him as one of the main characters. We also have a few other characters from Madworld making an appearance in Anarchy Reigns as well." The studio doesn’t see any sequel link between them.
"No, in terms of the story and the universe, there’s no direct continuity. The relationship is really more inspirational than anything," he concluded. Madworld's Jack is the real up close brawler who's not above fighting dirty.
"Jack is quite a rough, no-method kind of guy. His style is really a sort of street fighting, just punching and kicking in whatever way works for him. He brandishes his right arm and uses his chainsaw to slash everyone into little pieces. So very barbaric."
In between all the fighting players can explore 'hub zones' that let you pick up side missions, but "you also have some tough enemies wandering around too." You have to defeat these bad guys in order to accumulate enough points to unlock missions.
Anarchy Reigns released on Xbox 360 and PS3 late this year.