An Eastern Dictator El Hudat is being held prisoner in the Marineville jail for offences against the World Aquanaut Security Patrol. Meanwhile, his brother Ali Khali is on his way to Marineville, having escaped after a counter revolution in which he has lost power and once more his brother is enthroned. However, Agent X20 has a plan in which he will exchange the brothers, who are identical twins, and thus return the imprisoned El Hudat to his country.

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