Neeson is playing Zeus, the wise yet sometimes ill-tempered king of the gods and father of Perseus (Sam Worthington).
Fiennes will play Hades, ruler of the underworld who aims to overtake Zeus and rule over all. Fiennes' deal is in still in negotiations.
The two actors join Mads Mikkelsen, Gemma Arterton and Alexa Davalos in the production, which begins shooting later this month in the U.K.
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