The Flash takes the twins to Gorilla City on their first international mission, and the round-the-world trip becomes an adventure in itself! Plus, the upheavals at Keystone News result in a huge discovery — one that could blow the Wests' cover for good!

Iris is becoming older and older every second and Flash, partly under control by Grodd, searches for Nzame, the gorilla healer, while trying to find a cure for his daughter.