The story of "Captain Thunder and the Holy Grail" is set during the Third Crusade in Palestine, when Captain Thunder finds in the dungeons of a fortress a dying Christian named Juan de Ribera, who entrustes him the mission to … Sergio Peris-Mencheta, Natasha Yarovenko, Adrián Lamana, Man Martínez, Gary Piquer, Luis Fernando Alvés, Natalia Rodríguez Added on NOW 2023-02-03, leaving 2024-03-31. Added on Amazon Prime 2021-05-07. Youtube Trailer