User blog comment:Blitz0248/Where's Chaos and Zavok?/@comment-477304-20171115223504

If you're talking about the real Chaos and Zavok, Chaos presumably went to the afterlife after Adventure, but has the capacity to back if he wishes (as seem in Sonic Battle, additionally Knuckles was unfazed when he saw Chaos in the Sonic Forces Stress Test comic). Zavok is presumed dead after his defeat in Sonic Lost World.