diff --git a/BizHawk.Client.Common/movie/tasproj/TasStateManager.cs b/BizHawk.Client.Common/movie/tasproj/TasStateManager.cs
index 188edbe604..394783343a 100644
--- a/BizHawk.Client.Common/movie/tasproj/TasStateManager.cs
+++ b/BizHawk.Client.Common/movie/tasproj/TasStateManager.cs
@@ -25,6 +25,16 @@ namespace BizHawk.Client.Common
 			}
 		}
 
+		public Action<int> InvalidateCallback { get; set; }
+
+		private void CallInvalidateCallback(int index)
+		{
+			if (InvalidateCallback != null)
+			{
+				InvalidateCallback(index);
+			}
+		}
+
 		private readonly SortedList<int, byte[]> States = new SortedList<int, byte[]>();
 		private string statePath
 		{
@@ -329,6 +339,8 @@ namespace BizHawk.Client.Common
 					accessed.Remove(state.Key);
 					States.Remove(state.Key);
 				}
+
+				CallInvalidateCallback(frame);
 			}
 		}
 
diff --git a/BizHawk.Client.EmuHawk/tools/Lua/Libraries/EmuLuaLibrary.Tastudio.cs b/BizHawk.Client.EmuHawk/tools/Lua/Libraries/EmuLuaLibrary.Tastudio.cs
index 5367f1230d..04f26a6c01 100644
--- a/BizHawk.Client.EmuHawk/tools/Lua/Libraries/EmuLuaLibrary.Tastudio.cs
+++ b/BizHawk.Client.EmuHawk/tools/Lua/Libraries/EmuLuaLibrary.Tastudio.cs
@@ -173,5 +173,20 @@ namespace BizHawk.Client.EmuHawk
 				};
 			}
 		}
+
+		[LuaMethodAttributes(
+			"ongreenzoneinvalidated",
+			"called whenever the greenzone is invalidated and returns the first frame that was invalidated"
+		)]
+		public void OnGreenzoneInvalidated(LuaFunction luaf)
+		{
+			if (Engaged())
+			{
+				Tastudio.GreenzoneInvalidatedCallback = (int index) =>
+				{
+					luaf.Call(index);
+				};
+			}
+		}
 	}
 }
diff --git a/BizHawk.Client.EmuHawk/tools/TAStudio/TAStudio.ListView.cs b/BizHawk.Client.EmuHawk/tools/TAStudio/TAStudio.ListView.cs
index e3861d91e4..6a613abd82 100644
--- a/BizHawk.Client.EmuHawk/tools/TAStudio/TAStudio.ListView.cs
+++ b/BizHawk.Client.EmuHawk/tools/TAStudio/TAStudio.ListView.cs
@@ -121,6 +121,15 @@ namespace BizHawk.Client.EmuHawk
 			return null;
 		}
 
+		public Action<int> GreenzoneInvalidatedCallback { get; set; }
+		private void GreenzoneInvalidated(int index)
+		{
+			if (GreenzoneInvalidatedCallback != null)
+			{
+				GreenzoneInvalidatedCallback(index);
+			}
+		}
+
 		#endregion
 
 		private void TasView_QueryItemBkColor(int index, InputRoll.RollColumn column, ref Color color)
diff --git a/BizHawk.Client.EmuHawk/tools/TAStudio/TAStudio.cs b/BizHawk.Client.EmuHawk/tools/TAStudio/TAStudio.cs
index 3f1c589b3a..6061dff40c 100644
--- a/BizHawk.Client.EmuHawk/tools/TAStudio/TAStudio.cs
+++ b/BizHawk.Client.EmuHawk/tools/TAStudio/TAStudio.cs
@@ -328,6 +328,7 @@ namespace BizHawk.Client.EmuHawk
 			if (CurrentTasMovie == null)
 			{
 				Global.MovieSession.Movie = new TasMovie(false, _saveBackgroundWorker);
+				(Global.MovieSession.Movie as TasMovie).TasStateManager.InvalidateCallback = GreenzoneInvalidated;
 			}
 
 			CurrentTasMovie.Filename = file.FullName;
@@ -357,6 +358,7 @@ namespace BizHawk.Client.EmuHawk
 			if (AskSaveChanges())
 			{
 				Global.MovieSession.Movie = new TasMovie(false, _saveBackgroundWorker);
+				(Global.MovieSession.Movie as TasMovie).TasStateManager.InvalidateCallback = GreenzoneInvalidated;
 				CurrentTasMovie.PropertyChanged += new PropertyChangedEventHandler(this.TasMovie_OnPropertyChanged);
 				CurrentTasMovie.Filename = DefaultTasProjName(); // TODO don't do this, take over any mainform actions that can crash without a filename
 				CurrentTasMovie.PopulateWithDefaultHeaderValues();