Javascript dot operator

I am a javascript noob so i dont understand why in the code below the author uses Avengers.cast instead of just Avengers?

var myApp = angular.module('myApp', []);
    myApp.factory('Avengers', function() {
        var Avengers = {};
        Avengers.cast = [{
            name: "Robert Downey Jr.",
            character: "Tony Stark / Iron Man"
        }];
        return Avengers;
    })


function AvengersCtrl($scope, Avengers) {
    $scope.avengers = Avengers;
}

    var Avengers = {};

This means: create a new object and refer to it by the variable Avengers

    Avengers.cast = [{
        name: "Robert Downey Jr.",
        character: "Tony Stark / Iron Man"
    }];

This means: the object just created now has a property called cast. This is an Array and contains exactly one object (with two properties with String values).