diff --git a/metatag.inc b/metatag.inc
index 09bef4e..6b38e5a 100644
--- a/metatag.inc
+++ b/metatag.inc
@@ -69,7 +69,15 @@ class DrupalDefaultMetaTag implements DrupalMetaTagInterface {
    *   A standard FormAPI array.
    */
   public function getForm(array $options = array()) {
-    return array();
+    $form = array();
+    $form['allow_override'] = array(
+      '#type' => 'checkbox',
+      '#title' => t('Allow override'),
+      '#description' => t('Allow the parent configuration to override this one if the value is empty.'),
+      '#default_value' => isset($this->data['allow_override']) ? $this->data['allow_override'] : 0,
+      '#weight' => 20,
+    );
+    return $form;
   }
 
   /**
@@ -230,6 +238,7 @@ class DrupalTextMetaTag extends DrupalDefaultMetaTag {
    * {@inheritdoc}
    */
   public function getForm(array $options = array()) {
+    $form = parent::getForm($options);
     $options += array(
       'token types' => array(),
     );
@@ -448,6 +457,7 @@ class DrupalListMetaTag extends DrupalDefaultMetaTag {
    * {@inheritdoc}
    */
   public function getForm(array $options = array()) {
+    $form = parent::getForm($options);
     $form['value'] = isset($this->info['form']) ? $this->info['form'] : array();
 
     $form['value'] += array(
@@ -488,6 +498,7 @@ class DrupalDateIntervalMetaTag extends DrupalDefaultMetaTag {
    * {@inheritdoc}
    */
   public function getForm(array $options = array()) {
+    $form = parent::getForm($options);
     $form['value'] = array(
       '#type' => 'textfield',
       '#title' => t('!title interval', array('!title' => $this->info['label'])),
diff --git a/metatag.module b/metatag.module
index 5fbe3ea..7a2cea4 100644
--- a/metatag.module
+++ b/metatag.module
@@ -1257,16 +1257,30 @@ function metatag_metatags_view($instance, array $metatags = array(), array $opti
 
   // Don't output meta tags that only contain the pager.
   $current_pager = metatag_get_current_pager();
-
+  $overrides = array();
   foreach ($metatags as $metatag => $data) {
     if ((!empty($data['value']) || (isset($data['value']) && is_numeric($data['value'])))
       && $metatag_instance = metatag_get_instance($metatag, $data)) {
-      $tag_output = $metatag_instance->getElement($options);
-      // Don't output the pager if that's all there is.
-      if ($tag_output != $current_pager) {
-        $output[$metatag] = $tag_output;
+      $output[$metatag] = $metatag_instance->getElement($options);
+      // If overrides are allowed for this metatag and the metatag is empty,
+      // flag that we need to apply overrides.
+      if (empty($output[$metatag]) && !empty($data['allow_override'])) {
+        $overrides[] = $metatag;
       }
     }
+    // If overrides are allowed for this metatag, flag that we need to apply
+    // overrides.
+    elseif (!empty($data['allow_override'])) {
+      $overrides[] = $metatag;
+    }
+  }
+
+  // If there are any metatags that require overriding, do so.
+  if ($overrides) {
+    $instances = metatag_config_get_parent_instances($instance, TRUE, FALSE);
+    if ($instances) {
+      metatag_metatags_apply_overrides($output, $instances, $overrides, $options);
+    }
   }
 
   // Allow the output meta tags to be modified using
@@ -1293,6 +1307,48 @@ function metatag_get_current_pager() {
   }
 }
 
+/*
+ * Handle applying parent instance overrides to metatags.
+ *
+ * @param array $output
+ *   The metatag output array.
+ * @param array $instances
+ *   The parent instances to get overriding metatags from.
+ * @param array $overrides
+ *   The metatag names that are to be overridden.
+ * @param array $options
+ *   The options to use to generate the metatags.
+ */
+function metatag_metatags_apply_overrides(&$output, $instances, $overrides, $options) {
+  // Get the instance we are currently interested in.
+  $instance = array_shift($instances);
+
+  // Get metatags for this instance.
+  $metatags = metatag_config_load_with_defaults($instance);
+
+  foreach ($overrides as $key => $metatag) {
+    $data = $metatags[$metatag];
+    if ((!empty($data['value']) || (isset($data['value']) && is_numeric($data['value'])))
+      && $metatag_instance = metatag_get_instance($metatag, $data)) {
+      $output[$metatag] = $metatag_instance->getElement($options);
+      // If we have a value or overrides aren't allowed at this level, remove
+      // them from the list of overrides.
+      if (!empty($output[$metatag]) || empty($data['allow_override'])) {
+        unset($overrides[$key]);
+      }
+    }
+    // If overrides aren't allowed at this level, remove them from the list of
+    // overrides.
+    elseif (empty($data['allow_override'])) {
+      unset($overrides[$key]);
+    }
+  }
+
+  if ($overrides && $instances) {
+    metatag_metatags_apply_overrides($output, $instances, $overrides, $options);
+  }
+}
+
 /**
  * Returns metatags values.
  */
@@ -1452,6 +1508,12 @@ function metatag_metatags_form(array &$form, $instance, array $metatags = array(
       $metatag_form['#access'] = $form['metatags']['#access'];
     }
 
+    // Wrap the form in a fieldset as it will likely contain multiple fields.
+    $metatag_form = array(
+      '#type' => 'fieldset',
+      '#title' => isset($metatag_form['value']['#title']) ? $metatag_form['value']['#title'] : '',
+    ) + $metatag_form;
+
     if (!empty($metatag_info['group'])) {
       $group_key = $metatag_info['group'];
       if (isset($info['groups'][$group_key]['label']) && !isset($form['metatags'][$langcode][$group_key])) {
@@ -2290,12 +2352,16 @@ function metatag_filter_values_from_defaults(array &$values, array $defaults = a
  *
  * @param string $instance
  *   A meta tag configuration instance.
+ * @param array $include_global
+ *   Whether or not to include the global instance in the parents array.
+ * @param array $include_instance
+ *   Whether or not to include the given instance in the parents array.
  *
  * @return array
  *   An array of instances starting with the $instance parameter, with the end
  *   of the array being the global instance.
  */
-function metatag_config_get_parent_instances($instance, $include_global = TRUE) {
+function metatag_config_get_parent_instances($instance, $include_global = TRUE, $include_instance = TRUE) {
   $parents = array();
   $segments = explode(':', $instance);
   while (count($segments) > 0) {
@@ -2305,6 +2371,9 @@ function metatag_config_get_parent_instances($instance, $include_global = TRUE)
   if ($include_global && end($parents) !== 'global') {
     $parents[] = 'global';
   }
+  if (!$include_instance) {
+    array_shift($parents);
+  }
   reset($parents);
   return $parents;
 }