diff --git a/engines/grim/actor.cpp b/engines/grim/actor.cpp
index 2942cffa210..1aa40206fe1 100644
--- a/engines/grim/actor.cpp
+++ b/engines/grim/actor.cpp
@@ -74,7 +74,10 @@ Actor::Actor(const Common::String &actorName) :
 		_visible(true), _lipSync(NULL), _turning(false), _walking(false),
 		_walkedLast(false), _walkedCur(false),
 		_lastTurnDir(0), _currTurnDir(0),
-		_sayLineText(0), _talkDelay(0), _attachedActor(NULL), _attachedJoint("") {
+		_sayLineText(0), _talkDelay(0),
+		_attachedActor(NULL), _attachedJoint(""),
+		_global_alpha(1.f), _alphaMode(AlphaOff)  {
+	_inOverworld = false;
 	_lookingMode = false;
 	_constrain = false;
 	_talkSoundName = "";
@@ -112,6 +115,9 @@ Actor::Actor() {
 	_attachedActor = NULL;
 	_attachedJoint = "";
 
+	_alphaMode = AlphaOff;
+	_global_alpha = 1.f;
+
 	for (int i = 0; i < MAX_SHADOWS; i++) {
 		_shadowArray[i].active = false;
 		_shadowArray[i].dontNegate = false;
diff --git a/engines/grim/actor.h b/engines/grim/actor.h
index e9e34c1fe43..b036146543b 100644
--- a/engines/grim/actor.h
+++ b/engines/grim/actor.h
@@ -71,6 +71,12 @@ public:
 		CollisionSphere = 2
 	};
 
+	enum AlphaMode {
+		AlphaOff = -1,
+		AlphaReplace = 2,
+		AlphaModulate = 3 // Seems to be unused
+	};
+
 	/**
 	 * Initializes an actor with the given name.
 	 *
@@ -467,6 +473,9 @@ public:
 	void setInOverworld(bool inOverworld) { _inOverworld = inOverworld; }
 	bool isInOverworld() { return _inOverworld; }
 
+	void setGlobalAlpha(float alpha) { _global_alpha = alpha; }
+	void setAlphaMode(AlphaMode mode) { _alphaMode = mode; }
+
 private:
 	void costumeMarkerCallback(int marker);
 	void collisionHandlerCallback(Actor *other) const;
@@ -600,6 +609,8 @@ private:
 	int _talkDelay;
 	Actor *_attachedActor;
 	Common::String _attachedJoint;
+	AlphaMode _alphaMode;
+	float _global_alpha;
 
 	bool _inOverworld;
 
diff --git a/engines/grim/emi/lua_v2_actor.cpp b/engines/grim/emi/lua_v2_actor.cpp
index 6a73a0d92c2..03375e8781b 100644
--- a/engines/grim/emi/lua_v2_actor.cpp
+++ b/engines/grim/emi/lua_v2_actor.cpp
@@ -56,8 +56,8 @@ void Lua_V2::SetActorLocalAlpha() {
 
 void Lua_V2::SetActorGlobalAlpha() {
 	lua_Object actorObj = lua_getparam(1);
-//	lua_Object alphaModeObj = lua_getparam(2);
-//	lua_Object valueObj = lua_getparam(3);
+	lua_Object alphaObj = lua_getparam(2);
+//  lua_Object meshObj = lua_getparam(3);
 
 	if (!lua_isuserdata(actorObj) || lua_tag(actorObj) != MKTAG('A','C','T','R'))
 		return;
@@ -66,19 +66,17 @@ void Lua_V2::SetActorGlobalAlpha() {
 	if (!actor)
 		return;
 
-	warning("Lua_V2::SetActorGlobalAlpha: actor: %s", actor->getName().c_str());
-
-	/* Only when actor has primitives
-	if (!actor->primities)
+	if (!lua_isnumber(alphaObj))
 			return;
-	if (lua_isnumber(alphaModeObj) {
-		int alphaMode = (int)lua_getnumber(alphaModeObj);
-		if (!lua_isnil(valueObj) && lua_isstring(valueObj)) {
-				// TODO: missing part
-		}
-		// TODO
+
+	float alpha = lua_getnumber(alphaObj);
+	if (alpha == Actor::AlphaOff ||
+	    alpha == Actor::AlphaReplace ||
+	    alpha == Actor::AlphaModulate) {
+			actor->setAlphaMode((Actor::AlphaMode) (int) alpha);
+	} else {
+		actor->setGlobalAlpha(alpha);
 	}
-	*/
 }
 
 void Lua_V2::PutActorInOverworld() {