This Halloween party takes place after the events of the Octo Expansion. Sonic and the others are celebrating Halloween in Inkopolis with Callie and Marie for the Splatoween Splatfest. Splatoon owned by Nintendo. Sonic owned by Sega/Sonic Team.
The people of inkopolis was preparing for splatoween. all was going well, until... some spooky things were happening! its up to agent 3, agent 4 and agent 8 to stop the spooky madness!