diff --git a/LEGO1/legoworldpresenter.cpp b/LEGO1/legoworldpresenter.cpp
index 52e99926..7a17ad7a 100644
--- a/LEGO1/legoworldpresenter.cpp
+++ b/LEGO1/legoworldpresenter.cpp
@@ -2,6 +2,14 @@
 
 #include "legoentity.h"
 #include "legoomni.h"
+#include "legovideomanager.h"
+#include "mxactionnotificationparam.h"
+#include "mxautolocker.h"
+#include "mxdsactionlist.h"
+#include "mxdsmultiaction.h"
+#include "mxobjectfactory.h"
+#include "mxpresenter.h"
+#include "mxstl/stlcompat.h"
 
 // GLOBAL: LEGO1 0x100f75d4
 undefined4 g_legoWorldPresenterQuality = 1;
@@ -24,10 +32,56 @@ LegoWorldPresenter::~LegoWorldPresenter()
 	// TODO
 }
 
-// STUB: LEGO1 0x10066870
+// FUNCTION: LEGO1 0x10066870
 MxResult LegoWorldPresenter::StartAction(MxStreamController* p_controller, MxDSAction* p_action)
 {
-	return FAILURE;
+	MxAutoLocker lock(&m_criticalSection);
+
+	MxResult result = FAILURE;
+	MxDSActionList* actions = ((MxDSMultiAction*) p_action)->GetActionList();
+	MxObjectFactory* factory = ObjectFactory();
+	MxDSActionListCursor cursor(actions);
+	MxDSAction* action;
+
+	if (MxPresenter::StartAction(p_controller, p_action) == SUCCESS) {
+		// The usual cursor.Next() loop doesn't match here, even though
+		// the logic is the same. It does match when "deconstructed" into
+		// the following Head(), Current() and NextFragment() calls,
+		// but this seems unlikely to be the original code.
+		// The alpha debug build also uses Next().
+		cursor.Head();
+		while (cursor.Current(action)) {
+			cursor.NextFragment();
+
+			MxBool success = FALSE;
+
+			action->CopyFlags(m_action->GetFlags());
+
+			const char* presenterName = PresenterNameDispatch(*action);
+			MxPresenter* presenter = (MxPresenter*) factory->Create(presenterName);
+
+			if (presenter && presenter->AddToManager() == SUCCESS) {
+				presenter->SetCompositePresenter(this);
+				if (presenter->StartAction(p_controller, action) == SUCCESS) {
+					presenter->SetTickleState(TickleState_Idle);
+					success = TRUE;
+				}
+			}
+
+			if (success) {
+				action->SetOrigin(this);
+				m_list.push_back(presenter);
+			}
+			else if (presenter)
+				delete presenter;
+		}
+
+		VideoManager()->AddPresenter(*this);
+
+		result = SUCCESS;
+	}
+
+	return result;
 }
 
 // FUNCTION: LEGO1 0x10066a50