Following the events of Kingdom Rush: Vengeance Linirea is under the rule of Vez'nan, but a rebellion is forming in the forests to the south. The Kingdom is threatened by an interdimensional creature named The Overseer. An uneasy alliance is formed between Vez'nan's Dark Army and the Linirean rebels, to face this threat together. All the people from Linirea understand that is the time to unite their mighty forces to vanquish evil.