diff --git a/src/dobject.h b/src/dobject.h
index 51102bc4c..91a80f9d0 100644
--- a/src/dobject.h
+++ b/src/dobject.h
@@ -201,6 +201,7 @@ enum EObjectFlags
 	OF_EuthanizeMe		= 1 << 5,		// Object wants to die
 	OF_Cleanup			= 1 << 6,		// Object is now being deleted by the collector
 	OF_YesReallyDelete	= 1 << 7,		// Object is being deleted outside the collector, and this is okay, so don't print a warning
+	OF_Transient		= 1 << 11,		// Object should not be archived (references to it will be nulled on disk)
 
 	OF_WhiteBits		= OF_White0 | OF_White1,
 	OF_MarkBits			= OF_WhiteBits | OF_Black,
@@ -573,6 +574,9 @@ protected:
 	}
 };
 
+// When you write to a pointer to an Object, you must call this for
+// proper bookkeeping in case the Object holding this pointer has
+// already been processed by the GC.
 static inline void GC::WriteBarrier(DObject *pointing, DObject *pointed)
 {
 	if (pointed != NULL && pointed->IsWhite() && pointing->IsBlack())
diff --git a/src/gl/dynlights/gl_dynlight.cpp b/src/gl/dynlights/gl_dynlight.cpp
index 3fffe3641..ae19ecf60 100644
--- a/src/gl/dynlights/gl_dynlight.cpp
+++ b/src/gl/dynlights/gl_dynlight.cpp
@@ -1081,6 +1081,7 @@ void gl_AttachLight(AActor *actor, unsigned int count, const FLightDefaults *lig
 		light = Spawn<ADynamicLight>(actor->Pos(), NO_REPLACE);
 		light->target = actor;
 		light->owned = true;
+		light->ObjectFlags |= OF_Transient;
 		actor->dynamiclights.Push(light);
 	}
 	light->flags2&=~MF2_DORMANT;
diff --git a/src/gl/scene/gl_scene.cpp b/src/gl/scene/gl_scene.cpp
index 13b210d91..13eb254ce 100644
--- a/src/gl/scene/gl_scene.cpp
+++ b/src/gl/scene/gl_scene.cpp
@@ -1230,7 +1230,6 @@ void FGLInterface::StateChanged(AActor *actor)
 
 void FGLInterface::StartSerialize(FSerializer &arc)
 {
-	gl_DeleteAllAttachedLights();
 	if (arc.BeginObject("glinfo"))
 	{
 		arc("fogdensity", fogdensity)
@@ -1242,8 +1241,11 @@ void FGLInterface::StartSerialize(FSerializer &arc)
 
 void FGLInterface::EndSerialize(FSerializer &arc)
 {
-	gl_RecreateAllAttachedLights();
-	if (arc.isReading()) gl_InitPortals();
+	if (arc.isReading())
+	{
+		gl_RecreateAllAttachedLights();
+		gl_InitPortals();
+	}
 }
 
 //===========================================================================
diff --git a/src/p_mobj.cpp b/src/p_mobj.cpp
index 1ebec242e..8f926ea77 100644
--- a/src/p_mobj.cpp
+++ b/src/p_mobj.cpp
@@ -3799,6 +3799,8 @@ void AActor::Tick ()
 		else if (Z() <= floorz)
 		{
 			Crash();
+			if (ObjectFlags & OF_EuthanizeMe)
+				return;		// actor was destroyed
 		}
 
 		CheckPortalTransition(true);
diff --git a/src/serializer.cpp b/src/serializer.cpp
index 7861701c0..3a66a8397 100644
--- a/src/serializer.cpp
+++ b/src/serializer.cpp
@@ -1451,7 +1451,7 @@ FSerializer &Serialize(FSerializer &arc, const char *key, DObject *&value, DObje
 			{
 				ndx = -1;
 			}
-			else if (value->ObjectFlags & OF_EuthanizeMe)
+			else if (value->ObjectFlags & (OF_EuthanizeMe | OF_Transient))
 			{
 				return arc;
 			}
diff --git a/src/textures/animations.cpp b/src/textures/animations.cpp
index 74f9b1f55..f46289f07 100644
--- a/src/textures/animations.cpp
+++ b/src/textures/animations.cpp
@@ -161,6 +161,16 @@ FAnimDef *FTextureManager::AddComplexAnim (FTextureID picnum, const TArray<FAnim
 // [RH] Rewritten to support BOOM ANIMATED lump but also make absolutely
 //		no assumptions about how the compiler packs the animdefs array.
 //
+// Since animdef_t no longer exists in ZDoom, here is some documentation
+// of the format:
+//
+//   This is an array of <n> entries, terminated by a 0xFF byte. Each entry
+//   is 23 bytes long and consists of the following fields:
+//     Byte      0: Bit 1 set for wall texture, clear for flat texture.
+//     Bytes   1-9: '\0'-terminated name of first texture.
+//     Bytes 10-18: '\0'-terminated name of last texture.
+//     Bytes 19-22: Tics per frame (stored in little endian order).
+//
 //==========================================================================
 
 CVAR(Bool, debuganimated, false, 0)
diff --git a/wadsrc/static/animated.lmp b/wadsrc/static/animated.lmp
deleted file mode 100644
index 100c804c8..000000000
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diff --git a/wadsrc/static/filter/game-doomchex/animated.lmp b/wadsrc/static/filter/game-doomchex/animated.lmp
new file mode 100644
index 000000000..016ce1fa3
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diff --git a/wadsrc/static/filter/game-heretic/animated.lmp b/wadsrc/static/filter/game-heretic/animated.lmp
new file mode 100644
index 000000000..80102c88e
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diff --git a/wadsrc/static/filter/game-strife/animated.lmp b/wadsrc/static/filter/game-strife/animated.lmp
new file mode 100644
index 000000000..ca656cfc3
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