void Start()
 {
     episode_controller  = GameObject.Find("EpisodeController").GetComponent <EpisodeController> ();
     agent_player1_red   = episode_controller.GetPlayer1Ref(true);
     agent_player2_red   = episode_controller.GetPlayer2Ref(true);
     agent_player1_green = episode_controller.GetPlayer1Ref(false);
     agent_player2_green = episode_controller.GetPlayer2Ref(false);
     Debug.Log(agent_player1_red == null);
 }