diff --git a/code/addons/docs/src/blocks/controls/options/Options.tsx b/code/addons/docs/src/blocks/controls/options/Options.tsx
index cb0eb2ce79dc..0c8ec9c10015 100644
--- a/code/addons/docs/src/blocks/controls/options/Options.tsx
+++ b/code/addons/docs/src/blocks/controls/options/Options.tsx
@@ -21,7 +21,12 @@ import { SelectControl } from './Select';
 const normalizeOptions = (options: Options, labels?: Record<any, string>) => {
   if (Array.isArray(options)) {
     return options.reduce((acc, item) => {
-      acc[labels?.[item] || String(item)] = item;
+      const label = labels?.[item];
+      // Ensure the label is a string to avoid using non-string values (e.g., Array prototype
+      // methods) as object keys. This can happen when an option's name matches a built-in array
+      // method (e.g. 'reverse') and `labels` is inadvertently an array instead of a Record.
+      // See: https://github.com/storybookjs/storybook/issues/30142
+      acc[typeof label === 'string' && label !== '' ? label : String(item)] = item;
       return acc;
     }, {});
   }
diff --git a/code/addons/docs/src/blocks/controls/options/RadioOptions.stories.tsx b/code/addons/docs/src/blocks/controls/options/RadioOptions.stories.tsx
index e0a5bb706a4e..c492511bc2ab 100644
--- a/code/addons/docs/src/blocks/controls/options/RadioOptions.stories.tsx
+++ b/code/addons/docs/src/blocks/controls/options/RadioOptions.stories.tsx
@@ -115,3 +115,28 @@ export const ArrayReadonly: Story = {
     },
   },
 };
+
+// Regression test for https://github.com/storybookjs/storybook/issues/30142
+// Options whose names match Array prototype methods (e.g. 'reverse') must be
+// displayed as plain text, not as the stringified native function.
+const optionsWithArrayMethodNames = ['normal', 'reverse', 'filter', 'map'];
+export const ArrayWithBuiltinNames: Story = {
+  name: 'Array with option names matching built-in Array methods',
+  args: {
+    value: optionsWithArrayMethodNames[0],
+    argType: { options: optionsWithArrayMethodNames },
+  },
+};
+
+// Reproduces the exact bug from issue #30142: when `labels` is inadvertently an array
+// (instead of a Record), `labels?.['reverse']` resolves to `Array.prototype.reverse` — a
+// truthy native function — causing the label to render as "function reverse() { [native code] }".
+export const ArrayWithBuiltinNamesAndArrayLabels: Story = {
+  name: 'Array with built-in names and labels accidentally passed as array (bug #30142)',
+  args: {
+    value: optionsWithArrayMethodNames[0],
+    argType: { options: optionsWithArrayMethodNames },
+    // eslint-disable-next-line @typescript-eslint/no-explicit-any
+    labels: optionsWithArrayMethodNames as any,
+  },
+};