Class object overlapping

im still trying to learn and im trying to make a group of actors be added to a movie class, i made it work but i still have problems because if you add another actor the last one dissappears, i tried with a loop but i could do nothing.

class Movie {
    constructor(title,year,duration){
        this.title = title;
        this.year = year;
        this.duration = duration;
    }

    addCast(actors){
        this.actors = actors
    }
}     
class Actor {
    constructor(name,age)
    {  
        this.name = name;
        this.age = age;
    }
}

const terminator = new Movie('Terminator I', 1985, 60);
const arnold = new Actor('Arnold Schwarzenegger', 50);
const otherCast = [
    new Actor('Paul Winfield', 50),
    new Actor('Michael Biehn', 50),
    new Actor('Linda Hamilton', 50)
];
//From here it can not be modified
    let movieOne = new Movie("Kong","2018","2h30m");
    let movieTwo = new Movie("Joker","2019","2h03m");
    let movieThree = new Movie("John Wick 3", "2019", "1h49m");
    terminator.addCast(arnold);
    terminator.addCast(otherCast);
//To here it can not be modified
    console.log({movieOne,movieTwo,movieThree,terminator});

See? Arnold should be in the actors too but it isnt! Thanks for the help in advance.

Another thing, this is for an excercise and i can not modify the lines i commented.

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