A year ago, Cortex gave up and promised Ntropy that he can take over. But then, uka uka told Cortex to let N-gin take over and since cortex is scared of uka uka he let N-gin take over.
Ntropy found out and got mad at uka uka and N-gin then went to N sanity island realising he can't defeat anyone and asked crash to help him get rid of N-gin.
Later they finally reach the lab Then Ntropy starts to fight N-gin. Ntropy gets hit by a rocket then N-gin is just about to kill him untill Crash blocks the last hit with aku aku then crash defeats him and uka uka. Then Ntropy thanks him then sead "back to trying to kill you" then he chases crash out of the lab all the way to N sanity island.