diff --git a/build.js b/build.js
index 39fcdb193..45c5a6ff3 100755
--- a/build.js
+++ b/build.js
@@ -151,7 +151,7 @@
     'reject': ['filter', 'identity', 'isEqual', 'keys'],
     'rest': [],
     'result': ['isFunction'],
-    'runInContext': [],
+    'runInContext': ['extend'],
     'shuffle': ['forEach'],
     'size': ['keys'],
     'some': ['identity', 'isArray', 'isEqual', 'keys'],
@@ -972,15 +972,16 @@
     if (snippet) {
       if (funcName == 'runInContext') {
         source = source.replace(snippet, function() {
-          return snippet.replace(/^[\s\S]+?\n( *).+?context *=.+(\n[\s\S]+?\n)\1return lodash[\s\S]+$/, function() {
-            return arguments[2].replace(/^ {4}/gm, '  ');
-          });
+          return snippet
+            .replace(/^[\s\S]+?function runInContext[\s\S]+?context *= *context.+| *return lodash[\s\S]+$/g, '')
+            .replace(/^ {4}/gm, '  ');
         });
 
         source = source
           .replace(/context/g, 'window')
           .replace(/(?:\n +\/\*[^*]*\*+(?:[^\/][^*]*\*+)*\/)?\n *var Array *=[\s\S]+?;\n/, '')
-          .replace(/^ *var lodash *= *runInContext.+\n+/m, '');
+          .replace(/(return *|= *)_([;)])/g, '$1lodash$2')
+          .replace(/^ *var _ *=.+\n+/m, '');
       }
       else {
         source = source.replace(snippet, '');
diff --git a/dist/lodash.compat.js b/dist/lodash.compat.js
index 6f639b829..c28c89fab 100644
--- a/dist/lodash.compat.js
+++ b/dist/lodash.compat.js
@@ -123,7 +123,7 @@
    * @returns {Function} Returns the `lodash` function.
    */
   function runInContext(context) {
-    context || (context = window);
+    context = context ? _.extend(createObject(window), context) : window;
 
     /** Native constructor references */
     var Array = context.Array,
@@ -623,10 +623,8 @@
             : partialArgs;
         }
         if (this instanceof bound) {
-          // ensure `new bound` is an instance of `bound` and `func`
-          noop.prototype = func.prototype;
-          thisBinding = new noop;
-          noop.prototype = null;
+          // ensure `new bound` is an instance of `func`
+          thisBinding = createObject(func.prototype);
 
           // mimic the constructor's `return` behavior
           // http://es5.github.com/#x13.2.2
@@ -750,6 +748,20 @@
       );
     }
 
+    /**
+     * Creates a new object that inherits from the given `prototype` object.
+     *
+     * @private
+     * @param {Object} prototype The prototype object.
+     * @returns {Object} Returns the new object.
+     */
+    function createObject(prototype) {
+      noop.prototype = prototype;
+      var result = new noop;
+      noop.prototype = null;
+      return result;
+    }
+
     /**
      * A function compiled to iterate `arguments` objects, arrays, objects, and
      * strings consistenly across environments, executing the `callback` for each
@@ -5161,7 +5173,7 @@
   /*--------------------------------------------------------------------------*/
 
   // expose Lo-Dash
-  var lodash = runInContext();
+  var _ = runInContext();
 
   // some AMD build optimizers, like r.js, check for specific condition patterns like the following:
   if (typeof define == 'function' && typeof define.amd == 'object' && define.amd) {
@@ -5169,27 +5181,27 @@
     // case Lo-Dash was injected by a third-party script and not intended to be
     // loaded as a module. The global assignment can be reverted in the Lo-Dash
     // module via its `noConflict()` method.
-    window._ = lodash;
+    window._ = _;
 
     // define as an anonymous module so, through path mapping, it can be
     // referenced as the "underscore" module
     define(function() {
-      return lodash;
+      return _;
     });
   }
   // check for `exports` after `define` in case a build optimizer adds an `exports` object
   else if (freeExports) {
     // in Node.js or RingoJS v0.8.0+
     if (freeModule) {
-      (freeModule.exports = lodash)._ = lodash;
+      (freeModule.exports = _)._ = _;
     }
     // in Narwhal or RingoJS v0.7.0-
     else {
-      freeExports._ = lodash;
+      freeExports._ = _;
     }
   }
   else {
     // in a browser or Rhino
-    window._ = lodash;
+    window._ = _;
   }
 }(this));
diff --git a/dist/lodash.compat.min.js b/dist/lodash.compat.min.js
index d9edf97f9..b615d7ff4 100644
--- a/dist/lodash.compat.min.js
+++ b/dist/lodash.compat.min.js
@@ -4,40 +4,41 @@
  * Build: `lodash -o ./dist/lodash.compat.js`
  * Underscore.js 1.4.4 underscorejs.org/LICENSE
  */
-;(function(n){function t(i){function a(n){return n&&typeof n=="object"&&n.__wrapped__?n:this instanceof a?(this.__wrapped__=n,void 0):new a(n)}function R(n,t,r){t||(t=0);var e=n.length,u=e-t>=(r||p);if(u){var o={};for(r=t-1;++r<e;){var i=n[r]+"";(Jt.call(o,i)?o[i]:o[i]=[]).push(n[r])}}return function(r){if(u){var e=r+"";return Jt.call(o,e)&&-1<dt(o[e],r)}return-1<dt(n,r,t)}}function P(n){return n.charCodeAt(0)}function D(n,t){var r=n.b,e=t.b;if(n=n.a,t=t.a,n!==t){if(n>t||typeof n=="undefined")return 1;
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\ No newline at end of file
diff --git a/dist/lodash.js b/dist/lodash.js
index a327fc3ce..15759ab89 100644
--- a/dist/lodash.js
+++ b/dist/lodash.js
@@ -117,7 +117,7 @@
    * @returns {Function} Returns the `lodash` function.
    */
   function runInContext(context) {
-    context || (context = window);
+    context = context ? _.extend(createObject(window), context) : window;
 
     /** Native constructor references */
     var Array = context.Array,
@@ -505,10 +505,8 @@
             : partialArgs;
         }
         if (this instanceof bound) {
-          // ensure `new bound` is an instance of `bound` and `func`
-          noop.prototype = func.prototype;
-          thisBinding = new noop;
-          noop.prototype = null;
+          // ensure `new bound` is an instance of `func`
+          thisBinding = createObject(func.prototype);
 
           // mimic the constructor's `return` behavior
           // http://es5.github.com/#x13.2.2
@@ -627,6 +625,20 @@
       );
     }
 
+    /**
+     * Creates a new object that inherits from the given `prototype` object.
+     *
+     * @private
+     * @param {Object} prototype The prototype object.
+     * @returns {Object} Returns the new object.
+     */
+    function createObject(prototype) {
+      noop.prototype = prototype;
+      var result = new noop;
+      noop.prototype = null;
+      return result;
+    }
+
     /**
      * A function compiled to iterate `arguments` objects, arrays, objects, and
      * strings consistenly across environments, executing the `callback` for each
@@ -4986,7 +4998,7 @@
   /*--------------------------------------------------------------------------*/
 
   // expose Lo-Dash
-  var lodash = runInContext();
+  var _ = runInContext();
 
   // some AMD build optimizers, like r.js, check for specific condition patterns like the following:
   if (typeof define == 'function' && typeof define.amd == 'object' && define.amd) {
@@ -4994,27 +5006,27 @@
     // case Lo-Dash was injected by a third-party script and not intended to be
     // loaded as a module. The global assignment can be reverted in the Lo-Dash
     // module via its `noConflict()` method.
-    window._ = lodash;
+    window._ = _;
 
     // define as an anonymous module so, through path mapping, it can be
     // referenced as the "underscore" module
     define(function() {
-      return lodash;
+      return _;
     });
   }
   // check for `exports` after `define` in case a build optimizer adds an `exports` object
   else if (freeExports) {
     // in Node.js or RingoJS v0.8.0+
     if (freeModule) {
-      (freeModule.exports = lodash)._ = lodash;
+      (freeModule.exports = _)._ = _;
     }
     // in Narwhal or RingoJS v0.7.0-
     else {
-      freeExports._ = lodash;
+      freeExports._ = _;
     }
   }
   else {
     // in a browser or Rhino
-    window._ = lodash;
+    window._ = _;
   }
 }(this));
diff --git a/dist/lodash.min.js b/dist/lodash.min.js
index c389ce17f..ecee079ed 100644
--- a/dist/lodash.min.js
+++ b/dist/lodash.min.js
@@ -4,37 +4,37 @@
  * Build: `lodash modern -o ./dist/lodash.js`
  * Underscore.js 1.4.4 underscorejs.org/LICENSE
  */
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+}}),tr(["push","reverse","sort","unshift"],function(n){var t=It[n];o.prototype[n]=function(){return t.apply(this.__wrapped__,arguments),this}}),tr(["concat","slice","splice"],function(n){var t=It[n];o.prototype[n]=function(){return new o(t.apply(this.__wrapped__,arguments))}}),o}var r,e=typeof exports=="object"&&exports,u=typeof module=="object"&&module&&module.exports==e&&module,o=typeof global=="object"&&global;o.global===o&&(n=o);var i=0,f={},a=30,c=/&(?:amp|lt|gt|quot|#39);/g,l=/\b__p\+='';/g,p=/\b(__p\+=)''\+/g,s=/(__e\(.*?\)|\b__t\))\+'';/g,v=/\w*$/,g=/\$\{([^\\}]*(?:\\.[^\\}]*)*)\}/g,h=/<%=([\s\S]+?)%>/g,y=/($^)/,m=/[&<>"']/g,d=/['\n\r\t\u2028\u2029\\]/g,_="[object Arguments]",b="[object Array]",j="[object Boolean]",w="[object Date]",x="[object Number]",O="[object Object]",S="[object RegExp]",A="[object String]",k={"[object Function]":!1};
 k[_]=k[b]=k[j]=k[w]=k[x]=k[O]=k[S]=k[A]=!0;var E={"boolean":!1,"function":!0,object:!0,number:!1,string:!1,undefined:!1},N={"\\":"\\","'":"'","\n":"n","\r":"r","	":"t","\u2028":"u2028","\u2029":"u2029"},$=t();typeof define=="function"&&typeof define.amd=="object"&&define.amd?(n._=$,define(function(){return $})):e?u?(u.exports=$)._=$:e._=$:n._=$})(this);
\ No newline at end of file
diff --git a/dist/lodash.underscore.js b/dist/lodash.underscore.js
index 24f5fe269..944ab58bd 100644
--- a/dist/lodash.underscore.js
+++ b/dist/lodash.underscore.js
@@ -333,10 +333,8 @@
           : partialArgs;
       }
       if (this instanceof bound) {
-        // ensure `new bound` is an instance of `bound` and `func`
-        noop.prototype = func.prototype;
-        thisBinding = new noop;
-        noop.prototype = null;
+        // ensure `new bound` is an instance of `func`
+        thisBinding = createObject(func.prototype);
 
         // mimic the constructor's `return` behavior
         // http://es5.github.com/#x13.2.2
@@ -406,6 +404,20 @@
     return func;
   }
 
+  /**
+   * Creates a new object that inherits from the given `prototype` object.
+   *
+   * @private
+   * @param {Object} prototype The prototype object.
+   * @returns {Object} Returns the new object.
+   */
+  function createObject(prototype) {
+    noop.prototype = prototype;
+    var result = new noop;
+    noop.prototype = null;
+    return result;
+  }
+
   /**
    * A function compiled to iterate `arguments` objects, arrays, objects, and
    * strings consistenly across environments, executing the `callback` for each
diff --git a/lodash.js b/lodash.js
index abab37c6e..dc20d84c5 100644
--- a/lodash.js
+++ b/lodash.js
@@ -122,7 +122,7 @@
    * @returns {Function} Returns the `lodash` function.
    */
   function runInContext(context) {
-    context || (context = window);
+    context = context ? _.extend(createObject(window), context) : window;
 
     /** Native constructor references */
     var Array = context.Array,
@@ -630,10 +630,8 @@
             : partialArgs;
         }
         if (this instanceof bound) {
-          // ensure `new bound` is an instance of `bound` and `func`
-          noop.prototype = func.prototype;
-          thisBinding = new noop;
-          noop.prototype = null;
+          // ensure `new bound` is an instance of `func`
+          thisBinding = createObject(func.prototype);
 
           // mimic the constructor's `return` behavior
           // http://es5.github.com/#x13.2.2
@@ -757,6 +755,20 @@
       );
     }
 
+    /**
+     * Creates a new object that inherits from the given `prototype` object.
+     *
+     * @private
+     * @param {Object} prototype The prototype object.
+     * @returns {Object} Returns the new object.
+     */
+    function createObject(prototype) {
+      noop.prototype = prototype;
+      var result = new noop;
+      noop.prototype = null;
+      return result;
+    }
+
     /**
      * A function compiled to iterate `arguments` objects, arrays, objects, and
      * strings consistenly across environments, executing the `callback` for each
@@ -5172,7 +5184,7 @@
   /*--------------------------------------------------------------------------*/
 
   // expose Lo-Dash
-  var lodash = runInContext();
+  var _ = runInContext();
 
   // some AMD build optimizers, like r.js, check for specific condition patterns like the following:
   if (typeof define == 'function' && typeof define.amd == 'object' && define.amd) {
@@ -5180,27 +5192,27 @@
     // case Lo-Dash was injected by a third-party script and not intended to be
     // loaded as a module. The global assignment can be reverted in the Lo-Dash
     // module via its `noConflict()` method.
-    window._ = lodash;
+    window._ = _;
 
     // define as an anonymous module so, through path mapping, it can be
     // referenced as the "underscore" module
     define(function() {
-      return lodash;
+      return _;
     });
   }
   // check for `exports` after `define` in case a build optimizer adds an `exports` object
   else if (freeExports) {
     // in Node.js or RingoJS v0.8.0+
     if (freeModule) {
-      (freeModule.exports = lodash)._ = lodash;
+      (freeModule.exports = _)._ = _;
     }
     // in Narwhal or RingoJS v0.7.0-
     else {
-      freeExports._ = lodash;
+      freeExports._ = _;
     }
   }
   else {
     // in a browser or Rhino
-    window._ = lodash;
+    window._ = _;
   }
 }(this));
diff --git a/test/test.js b/test/test.js
index 8ad6f19cb..545b3c437 100644
--- a/test/test.js
+++ b/test/test.js
@@ -2114,6 +2114,25 @@
 
   /*--------------------------------------------------------------------------*/
 
+  QUnit.module('lodash.runInContext');
+
+  (function() {
+    test('should not require a fully populated `context` object', function() {
+      var pass = false;
+
+      var lodash = _.runInContext({
+        'setTimeout': function(callback) {
+          callback();
+        }
+      });
+
+      lodash.delay(function() { pass = true; }, 32);
+      ok(pass);
+    });
+  }());
+
+  /*--------------------------------------------------------------------------*/
+
   QUnit.module('lodash.shuffle');
 
   (function() {
@@ -2406,26 +2425,11 @@
       var callCount = 0,
           dateCount = 0;
 
-      var context = {
-        'Array': Array,
-        'Boolean': Boolean,
-        'Function': Function,
-        'Object': Object,
-        'Math': Math,
-        'Number': Number,
-        'RegExp': RegExp,
-        'String': String,
-        'clearTimeout': clearTimeout,
-        'isFinite': isFinite,
-        'isNaN': isNaN,
-        'setTimeout': setTimeout
-      };
-
-      var lodash = _.runInContext(_.extend(context, {
+      var lodash = _.runInContext({
         'Date': function() {
           return ++dateCount < 3 ? new Date : Object(Infinity);
         }
-      }));
+      });
 
       var throttled = lodash.throttle(function() {
         callCount++;