diff --git a/client/src/templates/Challenges/redux/execute-challenge-saga.js b/client/src/templates/Challenges/redux/execute-challenge-saga.js
index 4e51f880c41..2518931c52d 100644
--- a/client/src/templates/Challenges/redux/execute-challenge-saga.js
+++ b/client/src/templates/Challenges/redux/execute-challenge-saga.js
@@ -341,8 +341,7 @@ function* updatePython(challengeData) {
   interruptCodeExecution();
   const code = {
     contents: buildData.sources.index,
-    editableContents: buildData.sources.editableContents,
-    original: buildData.sources.original
+    editableContents: buildData.sources.editableContents
   };
 
   runPythonCode(code);
diff --git a/client/src/templates/Challenges/utils/build.ts b/client/src/templates/Challenges/utils/build.ts
index 17d18ad40c5..e1d3de02800 100644
--- a/client/src/templates/Challenges/utils/build.ts
+++ b/client/src/templates/Challenges/utils/build.ts
@@ -74,22 +74,18 @@ const applyFunction =
 const composeFunctions = (...fns: ApplyFunctionProps[]) =>
   fns.map(applyFunction).reduce((f, g) => x => f(x).then(g));
 
-// TODO: split this into at least two functions. One to create 'original' i.e.
-// the source and another to create the contents.
 function buildSourceMap(challengeFiles: ChallengeFile[]): Source | undefined {
   // TODO: rename sources.index to sources.contents.
   const source: Source | undefined = challengeFiles?.reduce(
     (sources, challengeFile) => {
       sources.index += challengeFile.source || '';
       sources.contents = sources.index;
-      sources.original[challengeFile.history[0]] = challengeFile.source ?? null;
       sources.editableContents += challengeFile.editableContents || '';
       return sources;
     },
     {
       index: '',
-      editableContents: '',
-      original: {}
+      editableContents: ''
     } as Source
   );
   return source;
@@ -181,8 +177,7 @@ function getWorkerTestRunner(
 ) {
   const code = {
     contents: sources.index,
-    editableContents: sources.editableContents,
-    original: sources.original
+    editableContents: sources.editableContents
   };
 
   interface TestWorkerExecutor extends WorkerExecutor {
diff --git a/client/src/templates/Challenges/utils/frame.ts b/client/src/templates/Challenges/utils/frame.ts
index 769a77c86ac..6960ed84492 100644
--- a/client/src/templates/Challenges/utils/frame.ts
+++ b/client/src/templates/Challenges/utils/frame.ts
@@ -13,7 +13,6 @@ export interface Source {
   index: string;
   contents?: string;
   editableContents: string;
-  original: { [key: string]: string | null };
 }
 
 interface Hooks {
diff --git a/client/src/templates/Challenges/utils/python-worker-handler.ts b/client/src/templates/Challenges/utils/python-worker-handler.ts
index be48b9a9c13..0137484e105 100644
--- a/client/src/templates/Challenges/utils/python-worker-handler.ts
+++ b/client/src/templates/Challenges/utils/python-worker-handler.ts
@@ -8,7 +8,6 @@ let listener: ((event: MessageEvent) => void) | null = null;
 type Code = {
   contents: string;
   editableContents: string;
-  original: string;
 };
 // We need to keep track of the last code message so we can re-run it if the
 // worker is reset.
@@ -102,7 +101,6 @@ export function interruptCodeExecution(): void {
 export function runPythonCode(code: {
   contents: string;
   editableContents: string;
-  original: string;
 }): void {
   lastCodeMessage = code;
   getPythonWorker().postMessage({ type: 'run', code });
diff --git a/curriculum/test/test-challenges.js b/curriculum/test/test-challenges.js
index 2b22b4fd430..3d590ceb003 100644
--- a/curriculum/test/test-challenges.js
+++ b/curriculum/test/test-challenges.js
@@ -570,8 +570,7 @@ async function createTestRunner(
 
   const code = {
     contents: sources.index,
-    editableContents: sources.editableContents,
-    original: sources.original
+    editableContents: sources.editableContents
   };
 
   const buildFunction = buildFunctions[challenge.challengeType];
diff --git a/tools/client-plugins/browser-scripts/frame-runner.ts b/tools/client-plugins/browser-scripts/frame-runner.ts
index fc6d9f4c829..abb71769d7a 100644
--- a/tools/client-plugins/browser-scripts/frame-runner.ts
+++ b/tools/client-plugins/browser-scripts/frame-runner.ts
@@ -11,13 +11,7 @@ frameDocument.__initTestFrame = initTestFrame;
 
 async function initTestFrame(e: InitTestFrameArg = { code: {} }) {
   const code = (e.code.contents || '').slice();
-  const __file = (id?: string) => {
-    if (id && e.code.original) {
-      return e.code.original[id];
-    } else {
-      return code;
-    }
-  };
+
   const editableContents = (e.code.editableContents || '').slice();
   // __testEditable allows test authors to run tests against a transitory dom
   // element built using only the code in the editable region.
diff --git a/tools/client-plugins/browser-scripts/index.d.ts b/tools/client-plugins/browser-scripts/index.d.ts
index 4367d1b3561..44422b52cde 100644
--- a/tools/client-plugins/browser-scripts/index.d.ts
+++ b/tools/client-plugins/browser-scripts/index.d.ts
@@ -18,7 +18,6 @@ export interface InitTestFrameArg {
   code: {
     contents?: string;
     editableContents?: string;
-    original?: { [id: string]: string | null };
   };
   getUserInput?: (fileName: string) => string;
   loadEnzyme?: () => void;
diff --git a/tools/client-plugins/browser-scripts/python-test-evaluator.ts b/tools/client-plugins/browser-scripts/python-test-evaluator.ts
index 154f4d4a55c..f69c11c210e 100644
--- a/tools/client-plugins/browser-scripts/python-test-evaluator.ts
+++ b/tools/client-plugins/browser-scripts/python-test-evaluator.ts
@@ -16,7 +16,6 @@ interface PythonRunEvent extends MessageEvent {
     code: {
       contents: string;
       editableContents: string;
-      original: { [id: string]: string };
     };
     firstTest: unknown;
     testString: string;
diff --git a/tools/client-plugins/browser-scripts/python-worker.ts b/tools/client-plugins/browser-scripts/python-worker.ts
index e91b2804da9..acc03dbbfbf 100644
--- a/tools/client-plugins/browser-scripts/python-worker.ts
+++ b/tools/client-plugins/browser-scripts/python-worker.ts
@@ -21,7 +21,6 @@ interface PythonRunEvent extends MessageEvent {
     code: {
       contents: string;
       editableContents: string;
-      original: { [id: string]: string };
     };
   };
 }
diff --git a/tools/client-plugins/browser-scripts/test-evaluator.ts b/tools/client-plugins/browser-scripts/test-evaluator.ts
index 3dd42108cc3..f4b4ba694e3 100644
--- a/tools/client-plugins/browser-scripts/test-evaluator.ts
+++ b/tools/client-plugins/browser-scripts/test-evaluator.ts
@@ -103,7 +103,6 @@ interface TestEvaluatorEvent extends MessageEvent {
     code: {
       contents: string;
       editableContents: string;
-      original: { [id: string]: string };
     };
     firstTest: unknown;
     testString: string;