diff --git a/src/engine/blocks.js b/src/engine/blocks.js
index 9e4a4c9ed..fb6634838 100644
--- a/src/engine/blocks.js
+++ b/src/engine/blocks.js
@@ -357,7 +357,7 @@ class Blocks {
         Object.keys(this._blocks).forEach(blockId => {
             if (this.getBlock(blockId).isMonitored) {
                 // @todo handle specific targets (e.g. apple x position)
-                runtime.toggleScript(blockId);
+                runtime.toggleScript(blockId, {updateMonitor: true});
             }
         });
     }
diff --git a/src/engine/execute.js b/src/engine/execute.js
index 2b66c5e73..b9e978749 100644
--- a/src/engine/execute.js
+++ b/src/engine/execute.js
@@ -60,6 +60,8 @@ const execute = function (sequencer, thread) {
      * or after a promise resolves.
      * @param {*} resolvedValue Value eventually returned from the primitive.
      */
+     // @todo move this to callback attached to the thread when we have performance
+     // metrics (dd)
     const handleReport = function (resolvedValue) {
         thread.pushReportedValue(resolvedValue);
         if (isHat) {
@@ -85,8 +87,22 @@ const execute = function (sequencer, thread) {
         } else {
             // In a non-hat, report the value visually if necessary if
             // at the top of the thread stack.
-            if (typeof resolvedValue !== 'undefined' && thread.showVisualReport && thread.atStackTop()) {
-                runtime.visualReport(currentBlockId, resolvedValue);
+
+            if (typeof resolvedValue !== 'undefined' && thread.atStackTop()) {
+                if (thread.showVisualReport) {
+                    runtime.visualReport(currentBlockId, resolvedValue);
+                }
+
+                if (thread.updateMonitor) {
+                    runtime.updateMonitors([{
+                        id: currentBlockId, // @todo(dd) this will collide if multiple sprites use same block
+                        category: 'data',
+                        label: blockContainer.getOpcode(blockContainer.getBlock(currentBlockId)), // @todo(dd) how to handle translation here?
+                        value: String(resolvedValue),
+                        x: 0, // @todo(dd) place below the last monitor instead
+                        y: 0
+                    }]);
+                }
             }
             // Finished any yields.
             thread.status = Thread.STATUS_RUNNING;
diff --git a/src/engine/runtime.js b/src/engine/runtime.js
index ae0295f88..c51333e50 100644
--- a/src/engine/runtime.js
+++ b/src/engine/runtime.js
@@ -377,13 +377,22 @@ class Runtime extends EventEmitter {
      * Create a thread and push it to the list of threads.
      * @param {!string} id ID of block that starts the stack.
      * @param {!Target} target Target to run thread on.
-     * @param {?boolean} optShowVisualReport true if the script should show speech bubble for its value
+     * @param {?object} opts optional arguments
+     * @param {?boolean} opts.optShowVisualReport true if the script should show speech bubble for its value
+     * @param {?boolean} opts.optUpdateMonitor true if the script should show and update a monitor with its value
      * @return {!Thread} The newly created thread.
      */
-    _pushThread (id, target, optShowVisualReport) {
+    _pushThread (id, target, opts) {
+        opts = Object.assign({
+            showVisualReport: false,
+            updateMonitor: false
+        }, opts);
+
         const thread = new Thread(id);
         thread.target = target;
-        thread.showVisualReport = optShowVisualReport;
+        thread.showVisualReport = opts.optShowVisualReport;
+        thread.updateMonitor = opts.updateMonitor;
+
         thread.pushStack(id);
         this.threads.push(thread);
         return thread;
@@ -436,8 +445,14 @@ class Runtime extends EventEmitter {
      * @param {?object} opts optional arguments to toggle script
      * @param {?string} opts.target target ID for target to run script on. If not supplied, uses editing target.
      * @param {?boolean} opts.showVisualReport true if the speech bubble should pop up on the block, false if not.
+     * @param {?boolean} opts.updateMonitor true if the monitor for this block should show and get updated.
      */
     toggleScript (topBlockId, opts) {
+        opts = Object.assign({
+            target: this._editingTarget,
+            showVisualReport: false,
+            updateMonitor: false
+        }, opts);
         // Remove any existing thread.
         for (let i = 0; i < this.threads.length; i++) {
             if (this.threads[i].topBlock === topBlockId) {
@@ -446,10 +461,7 @@ class Runtime extends EventEmitter {
             }
         }
         // Otherwise add it.
-        this._pushThread(
-            topBlockId,
-            opts && opts.target ? opts.target : this._editingTarget,
-            opts ? opts.showVisualReport : false);
+        this._pushThread(topBlockId, opts.target, opts);
     }
 
     /**
@@ -828,10 +840,10 @@ class Runtime extends EventEmitter {
     }
 
     /**
-     * Emit a monitor update.
+     * Emit a monitor update which adds or updates if exists the given monitors.
      * @param {!Array} monitors Array of all monitors
      */
-    monitorsUpdate (monitors) {
+    updateMonitors (monitors) {
         this.emit(Runtime.MONITORS_UPDATE, monitors);
     }
 
diff --git a/src/virtual-machine.js b/src/virtual-machine.js
index ed1ab98af..223620cb3 100644
--- a/src/virtual-machine.js
+++ b/src/virtual-machine.js
@@ -55,8 +55,8 @@ class VirtualMachine extends EventEmitter {
         instance.runtime.on(Runtime.SPRITE_INFO_REPORT, spriteInfo => {
             instance.emit(Runtime.SPRITE_INFO_REPORT, spriteInfo);
         });
-        instance.runtime.on(Runtime.MONITORS_UPDATE, spriteInfo => {
-            instance.emit(Runtime.MONITORS_UPDATE, spriteInfo);
+        instance.runtime.on(Runtime.MONITORS_UPDATE, data => {
+            instance.emit(Runtime.MONITORS_UPDATE, data);
         });
 
         this.blockListener = this.blockListener.bind(this);