diff --git a/src/FetchAuthTokenCache.php b/src/FetchAuthTokenCache.php
index 47174a1b7..cac1984ab 100644
--- a/src/FetchAuthTokenCache.php
+++ b/src/FetchAuthTokenCache.php
@@ -26,6 +26,7 @@
 class FetchAuthTokenCache implements
     FetchAuthTokenInterface,
     GetQuotaProjectInterface,
+    GetUniverseDomainInterface,
     SignBlobInterface,
     ProjectIdProviderInterface,
     UpdateMetadataInterface
@@ -191,6 +192,20 @@ public function getProjectId(callable $httpHandler = null)
         return $this->fetcher->getProjectId($httpHandler);
     }
 
+    /*
+     * Get the Universe Domain from the fetcher.
+     *
+     * @return string
+     */
+    public function getUniverseDomain(): string
+    {
+        if ($this->fetcher instanceof GetUniverseDomainInterface) {
+            return $this->fetcher->getUniverseDomain();
+        }
+
+        return GetUniverseDomainInterface::DEFAULT_UNIVERSE_DOMAIN;
+    }
+
     /**
      * Updates metadata with the authorization token.
      *
diff --git a/tests/FetchAuthTokenCacheTest.php b/tests/FetchAuthTokenCacheTest.php
index f59c9295a..21a68e702 100644
--- a/tests/FetchAuthTokenCacheTest.php
+++ b/tests/FetchAuthTokenCacheTest.php
@@ -21,6 +21,7 @@
 use Google\Auth\Credentials\ServiceAccountCredentials;
 use Google\Auth\CredentialsLoader;
 use Google\Auth\FetchAuthTokenCache;
+use Google\Auth\GetUniverseDomainInterface;
 use Prophecy\Argument;
 use Prophecy\PhpUnit\ProphecyTrait;
 use RuntimeException;
@@ -603,6 +604,41 @@ public function testGetProjectIdInvalidFetcher()
         $fetcher->getProjectId();
     }
 
+    public function testGetUniverseDomain()
+    {
+        $universeDomain = 'foobar';
+
+        $mockFetcher = $this->prophesize('Google\Auth\GetUniverseDomainInterface');
+        $mockFetcher->willImplement('Google\Auth\FetchAuthTokenInterface');
+        $mockFetcher->getUniverseDomain()
+            ->shouldBeCalled()
+            ->willReturn($universeDomain);
+
+        $fetcher = new FetchAuthTokenCache(
+            $mockFetcher->reveal(),
+            [],
+            $this->mockCache->reveal()
+        );
+
+        $this->assertEquals($universeDomain, $fetcher->getUniverseDomain());
+    }
+
+    public function testGetUniverseDomainInvalidFetcher()
+    {
+        $mockFetcher = $this->prophesize('Google\Auth\FetchAuthTokenInterface');
+
+        $fetcher = new FetchAuthTokenCache(
+            $mockFetcher->reveal(),
+            [],
+            $this->mockCache->reveal()
+        );
+
+        $this->assertEquals(
+            GetUniverseDomainInterface::DEFAULT_UNIVERSE_DOMAIN,
+            $fetcher->getUniverseDomain()
+        );
+    }
+
     public function testGetFetcher()
     {
         $mockFetcher = $this->prophesize('Google\Auth\FetchAuthTokenInterface')