diff --git a/src/com/onarandombox/MultiverseCore/MVEntityListener.java b/src/com/onarandombox/MultiverseCore/MVEntityListener.java
index 41c37f14..2baa758a 100644
--- a/src/com/onarandombox/MultiverseCore/MVEntityListener.java
+++ b/src/com/onarandombox/MultiverseCore/MVEntityListener.java
@@ -10,6 +10,7 @@ import org.bukkit.entity.Monster;
 import org.bukkit.entity.Player;
 import org.bukkit.entity.Slime;
 import org.bukkit.event.entity.CreatureSpawnEvent;
+import org.bukkit.event.entity.CreatureSpawnEvent.SpawnReason;
 import org.bukkit.event.entity.EntityDeathEvent;
 import org.bukkit.event.entity.EntityExplodeEvent;
 import org.bukkit.event.entity.EntityListener;
@@ -17,20 +18,20 @@ import org.bukkit.event.entity.EntityListener;
 //import org.bukkit.event.entity.ExplosionPrimedEvent;
 
 public class MVEntityListener extends EntityListener {
-    
+
     MultiverseCore plugin;
-    
+
     public MVEntityListener(MultiverseCore plugin) {
         this.plugin = plugin;
     }
-    
+
     // Need to find a way to stop the Ghast Fireballs damaging
     // surroundings but still doing damage to players.
     @Override
     public void onEntityExplode(EntityExplodeEvent event) {
-        
+
     }
-    
+
     @Override
     public void onEntityDeath(EntityDeathEvent event) {
         if (event.getEntity() instanceof Player) {
@@ -39,25 +40,30 @@ public class MVEntityListener extends EntityListener {
         }
         super.onEntityDeath(event);
     }
-    
+
     /**
      * Handle Animal/Monster Spawn settings, seems like a more concrete method than using CraftBukkit.
      */
     @Override
     public void onCreatureSpawn(CreatureSpawnEvent event) {
-        
+
+        // Check to see if the Creature is spawned by a plugin, we don't want to prevent this behaviour.
+        if (event.getSpawnReason() == SpawnReason.CUSTOM) {
+            return;
+        }
+
         World world = event.getEntity().getWorld();
         if (event.isCancelled())
             return;
-        
+
         // Check if it's a world which we are meant to be managing.
         if (!(this.plugin.isMVWorld(world.getName())))
             return;
-        
+
         CreatureType creature = event.getCreatureType();
-        
+
         MVWorld mvworld = this.plugin.getMVWorld(world.getName());
-        
+
         /**
          * Animal Handling
          */
@@ -71,7 +77,7 @@ public class MVEntityListener extends EntityListener {
             event.setCancelled(this.shouldWeKillThisCreature(mvworld.getMonsterList(), mvworld.allowMonsterSpawning(), creature.toString().toUpperCase()));
         }
     }
-    
+
     private boolean shouldWeKillThisCreature(List<String> creatureList, boolean allowCreatureSpawning, String creature) {
         if (creatureList.isEmpty() && allowCreatureSpawning) {
             // 1. There are no exceptions and animals are allowd. Save it.
@@ -86,14 +92,14 @@ public class MVEntityListener extends EntityListener {
             // 4. There ARE exceptions and animals ARE NOT allowed. SAVE it.
             return false;
         } else if (creatureList.contains(creature.toString().toUpperCase()) && !allowCreatureSpawning) {
-            // 5. No animals are allowed to be spawned, BUT this one can stay... 
+            // 5. No animals are allowed to be spawned, BUT this one can stay...
             return false;
         } else if (!creatureList.contains(creature.toString().toUpperCase()) && !allowCreatureSpawning) {
-            // 6. Animals are NOT allowd to spawn, and this creature is not in the save list... KILL IT 
+            // 6. Animals are NOT allowd to spawn, and this creature is not in the save list... KILL IT
             return true;
         }
         // This code should NEVER execute. I just left the verbose conditions in right now.
         return false;
     }
-    
+
 }