Help With GameObject

All I would like to know is how to call other game objects from other script. Here’s a part of script I have.

public GameObject Monster;                // The enemy prefab to be spawned.
        public Vector3 Zone1V;
        public Vector3 Zone2V;
        public Vector3 Zone3V;
        public Vector3 Zone4V;
        public Vector3 Zone5V;
        public Collider Zone1;
        public Collider Zone2;
        public Collider Zone3;
        public Collider Zone4;
        public Collider Zone5;
        GameObject SpawnedM;
        void Start()
        {
            mTrackableBehaviour = GetComponent<TrackableBehaviour>();
            if (mTrackableBehaviour)
            {
                mTrackableBehaviour.RegisterTrackableEventHandler (this);
            }

I have another script and all I want to call or access is the public game object Monster.

maybe this would help

This video I did explains conceptually some of the ways to access other scripts.