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diff --git a/tools/interop_matrix/create_testcases.sh b/tools/interop_matrix/create_testcases.sh
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+++ b/tools/interop_matrix/create_testcases.sh
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+#!/bin/bash
+# Copyright 2017 gRPC authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# Creates test cases for a language by running run_interop_test in manual mode
+# and save the generated output under ./testcases/<lang>__<release>.
+#
+# Params:
+#   LANG - The language.
+#   SKIP_TEST - If set, skip running the test cases for sanity.
+#   RELEASE - Create testcase for specific release, defautl to 'master'.
+#   KEEP_IMAGE - Do not clean local docker image created for the test cases.
+
+set -e
+
+cd $(dirname $0)/../..
+GRPC_ROOT=$(pwd)
+CMDS_SH="${GRPC_ROOT}/interop_client_cmds.sh"
+TESTCASES_DIR=${GRPC_ROOT}/tools/interop_matrix/testcases
+
+echo "Create '$LANG' test cases for gRPC release '${RELEASE:=master}'"
+
+# Invoke run_interop_test in manual mode.
+${GRPC_ROOT}/tools/run_tests/run_interop_tests.py -l $LANG --use_docker \
+  --cloud_to_prod --manual_run
+
+# Clean up
+function cleanup {
+  [ -z "$testcase" ] && testcase=$CMDS_SH
+  echo "testcase: $testcase"
+  if [ -e $testcase ]; then
+    # The script should generate a line with "${docker_image:=...}".
+    eval docker_image=$(grep -oe '${docker_image:=.*}' $testcase)
+    if [ -z "$KEEP_IMAGE" ]; then
+      echo "Clean up docker_image $docker_image"
+      docker rmi -f $docker_image
+    else
+      echo "Kept docker_image $docker_image"
+    fi
+  fi
+  [ -e "$CMDS_SH" ] && rm $CMDS_SH
+}
+trap cleanup EXIT
+# Running the testcases as sanity unless we are asked to skip.
+[ -z "$SKIP_TEST" ] && (echo "Running test cases: $CMDS_SH"; sh $CMDS_SH)
+
+mkdir -p $TESTCASES_DIR
+testcase=$TESTCASES_DIR/${LANG}__$RELEASE
+if [ -e $testcase ]; then
+  echo "Updating: $testcase"
+  diff $testcase $CMDS_SH || true
+fi
+mv $CMDS_SH $testcase
+chmod a+x $testcase
+echo "Test cases created: $testcase"