diff --git a/server/api/scan.ts b/server/api/scan.ts
index 76cf188..f906657 100644
--- a/server/api/scan.ts
+++ b/server/api/scan.ts
@@ -145,6 +145,17 @@ async function runScan(limit: number | null = null): Promise<void> {
 	const radarrEnabled = cfg.radarr_enabled === "1";
 	const sonarrEnabled = cfg.sonarr_enabled === "1";
 
+	// Log the external-source situation once per scan so it's obvious from
+	// logs whether Radarr/Sonarr are actually being consulted.
+	log(
+		`External language sources: radarr=${radarrEnabled ? `enabled (${cfg.radarr_url || "NO URL"})` : "disabled"}, sonarr=${sonarrEnabled ? `enabled (${cfg.sonarr_url || "NO URL"})` : "disabled"}`,
+	);
+	let radarrMisses = 0;
+	let radarrHits = 0;
+	let sonarrMisses = 0;
+	let sonarrHits = 0;
+	let missingProviderIds = 0;
+
 	let processed = 0;
 	let errors = 0;
 	let total = 0;
@@ -229,26 +240,46 @@ async function runScan(limit: number | null = null): Promise<void> {
 			let needsReview = origLang ? 0 : 1;
 			let authoritative = false; // set when Radarr/Sonarr answers
 
-			if (jellyfinItem.Type === "Movie" && radarrEnabled && (tmdbId || imdbId)) {
-				const lang = await radarrLang(
-					{ url: cfg.radarr_url, apiKey: cfg.radarr_api_key },
-					{ tmdbId: tmdbId ?? undefined, imdbId: imdbId ?? undefined },
-				);
-				if (lang) {
-					if (origLang && normalizeLanguage(origLang) !== normalizeLanguage(lang)) needsReview = 1;
-					origLang = lang;
-					origLangSource = "radarr";
-					authoritative = true;
+			if (jellyfinItem.Type === "Movie" && radarrEnabled) {
+				if (!tmdbId && !imdbId) {
+					missingProviderIds++;
+					warn(`No tmdb/imdb id on '${jellyfinItem.Name}' — Radarr lookup skipped`);
+				} else {
+					const lang = await radarrLang(
+						{ url: cfg.radarr_url, apiKey: cfg.radarr_api_key },
+						{ tmdbId: tmdbId ?? undefined, imdbId: imdbId ?? undefined },
+					);
+					if (lang) {
+						radarrHits++;
+						if (origLang && normalizeLanguage(origLang) !== normalizeLanguage(lang)) needsReview = 1;
+						origLang = lang;
+						origLangSource = "radarr";
+						authoritative = true;
+					} else {
+						radarrMisses++;
+						warn(
+							`Radarr returned no language for '${jellyfinItem.Name}' (tmdb=${tmdbId ?? "-"} imdb=${imdbId ?? "-"}) — falling back to Jellyfin guess`,
+						);
+					}
 				}
 			}
 
-			if (jellyfinItem.Type === "Episode" && sonarrEnabled && tvdbId) {
-				const lang = await sonarrLang({ url: cfg.sonarr_url, apiKey: cfg.sonarr_api_key }, tvdbId);
-				if (lang) {
-					if (origLang && normalizeLanguage(origLang) !== normalizeLanguage(lang)) needsReview = 1;
-					origLang = lang;
-					origLangSource = "sonarr";
-					authoritative = true;
+			if (jellyfinItem.Type === "Episode" && sonarrEnabled) {
+				if (!tvdbId) {
+					missingProviderIds++;
+					warn(`No tvdb id on '${jellyfinItem.Name}' — Sonarr lookup skipped`);
+				} else {
+					const lang = await sonarrLang({ url: cfg.sonarr_url, apiKey: cfg.sonarr_api_key }, tvdbId);
+					if (lang) {
+						sonarrHits++;
+						if (origLang && normalizeLanguage(origLang) !== normalizeLanguage(lang)) needsReview = 1;
+						origLang = lang;
+						origLangSource = "sonarr";
+						authoritative = true;
+					} else {
+						sonarrMisses++;
+						warn(`Sonarr returned no language for '${jellyfinItem.Name}' (tvdb=${tvdbId}) — falling back to Jellyfin guess`);
+					}
 				}
 			}
 
@@ -347,6 +378,9 @@ async function runScan(limit: number | null = null): Promise<void> {
 
 	setConfig("scan_running", "0");
 	log(`Scan complete: ${processed} scanned, ${errors} errors`);
+	log(
+		`  language sources: radarr hits=${radarrHits} misses=${radarrMisses}, sonarr hits=${sonarrHits} misses=${sonarrMisses}, no provider id=${missingProviderIds}`,
+	);
 	emitSse("complete", { scanned: processed, total, errors });
 }
 
diff --git a/server/services/radarr.ts b/server/services/radarr.ts
index bd6c353..15e5564 100644
--- a/server/services/radarr.ts
+++ b/server/services/radarr.ts
@@ -1,3 +1,4 @@
+import { error as logError, warn } from "../lib/log";
 import { normalizeLanguage } from "./jellyfin";
 
 export interface RadarrConfig {
@@ -27,39 +28,60 @@ interface RadarrMovie {
 	originalLanguage?: { name: string; nameTranslated?: string };
 }
 
+async function fetchJson<T>(url: string, cfg: RadarrConfig, context: string): Promise<T | null> {
+	try {
+		const res = await fetch(url, { headers: headers(cfg.apiKey) });
+		if (!res.ok) {
+			warn(`Radarr ${context} → HTTP ${res.status} (${url.replace(cfg.apiKey, "***")})`);
+			return null;
+		}
+		return (await res.json()) as T;
+	} catch (e) {
+		logError(`Radarr ${context} failed:`, e);
+		return null;
+	}
+}
+
 /** Returns ISO 639-2 original language or null. */
 export async function getOriginalLanguage(
 	cfg: RadarrConfig,
 	ids: { tmdbId?: string; imdbId?: string },
 ): Promise<string | null> {
-	try {
-		let movie: RadarrMovie | null = null;
-
-		if (ids.tmdbId) {
-			const res = await fetch(`${cfg.url}/api/v3/movie?tmdbId=${ids.tmdbId}`, {
-				headers: headers(cfg.apiKey),
-			});
-			if (res.ok) {
-				const list = (await res.json()) as RadarrMovie[];
-				movie = list[0] ?? null;
-			}
-		}
-
-		if (!movie && ids.imdbId) {
-			const res = await fetch(`${cfg.url}/api/v3/movie`, {
-				headers: headers(cfg.apiKey),
-			});
-			if (res.ok) {
-				const list = (await res.json()) as (RadarrMovie & { imdbId?: string })[];
-				movie = list.find((m) => m.imdbId === ids.imdbId) ?? null;
-			}
-		}
-
-		if (!movie?.originalLanguage) return null;
-		return iso6391To6392(movie.originalLanguage.name) ?? null;
-	} catch {
-		return null;
+	// 1. Library lookup by tmdbId: only hits movies actively managed in Radarr.
+	if (ids.tmdbId) {
+		const list = await fetchJson<RadarrMovie[]>(`${cfg.url}/api/v3/movie?tmdbId=${ids.tmdbId}`, cfg, "library/tmdb");
+		const movie = list?.[0];
+		if (movie?.originalLanguage) return nameToIso(movie.originalLanguage.name);
 	}
+
+	// 2. Library lookup by imdbId (sidestep: pull all and filter).
+	if (ids.imdbId) {
+		const list = await fetchJson<(RadarrMovie & { imdbId?: string })[]>(`${cfg.url}/api/v3/movie`, cfg, "library/all");
+		const movie = list?.find((m) => m.imdbId === ids.imdbId);
+		if (movie?.originalLanguage) return nameToIso(movie.originalLanguage.name);
+	}
+
+	// 3. Metadata lookup — asks Radarr to consult TMDB for movies NOT in the
+	//    library. This is the fix for the 8-Mile-in-Jellyfin-but-not-in-Radarr case.
+	if (ids.tmdbId) {
+		const result = await fetchJson<RadarrMovie>(
+			`${cfg.url}/api/v3/movie/lookup/tmdb?tmdbId=${ids.tmdbId}`,
+			cfg,
+			"lookup/tmdb",
+		);
+		if (result?.originalLanguage) return nameToIso(result.originalLanguage.name);
+	}
+
+	if (ids.imdbId) {
+		const result = await fetchJson<RadarrMovie>(
+			`${cfg.url}/api/v3/movie/lookup/imdb?imdbId=${ids.imdbId}`,
+			cfg,
+			"lookup/imdb",
+		);
+		if (result?.originalLanguage) return nameToIso(result.originalLanguage.name);
+	}
+
+	return null;
 }
 
 // Radarr returns language names like "English", "French", "German", etc.
@@ -74,9 +96,12 @@ const NAME_TO_639_2: Record<string, string> = {
 	japanese: "jpn",
 	korean: "kor",
 	chinese: "zho",
+	mandarin: "zho",
+	cantonese: "zho",
 	arabic: "ara",
 	russian: "rus",
 	dutch: "nld",
+	flemish: "nld",
 	swedish: "swe",
 	norwegian: "nor",
 	danish: "dan",
@@ -91,6 +116,7 @@ const NAME_TO_639_2: Record<string, string> = {
 	greek: "ell",
 	hebrew: "heb",
 	persian: "fas",
+	farsi: "fas",
 	ukrainian: "ukr",
 	indonesian: "ind",
 	malay: "msa",
@@ -98,11 +124,29 @@ const NAME_TO_639_2: Record<string, string> = {
 	catalan: "cat",
 	tamil: "tam",
 	telugu: "tel",
+	icelandic: "isl",
+	croatian: "hrv",
+	bulgarian: "bul",
+	serbian: "srp",
+	slovak: "slk",
+	slovenian: "slv",
+	latvian: "lav",
+	lithuanian: "lit",
+	estonian: "est",
 	"brazilian portuguese": "por",
 	"portuguese (brazil)": "por",
 };
 
-function iso6391To6392(name: string): string | null {
+/** Map a Radarr language name to ISO 639-2 or null. Logs unmapped names. */
+function nameToIso(name: string): string | null {
 	const key = name.toLowerCase().trim();
-	return NAME_TO_639_2[key] ?? normalizeLanguage(key.slice(0, 3)) ?? null;
+	if (NAME_TO_639_2[key]) return NAME_TO_639_2[key];
+	// If Radarr ever returns a bare code (e.g., "en", "eng"), normalizeLanguage
+	// will pass it through. Anything else is unknown — return null instead of
+	// guessing so scan.ts can mark needs_review.
+	if (key.length === 2 || key.length === 3) {
+		return normalizeLanguage(key);
+	}
+	warn(`Radarr language name not recognised: '${name}'. Add it to NAME_TO_639_2 or review upstream.`);
+	return null;
 }
diff --git a/server/services/sonarr.ts b/server/services/sonarr.ts
index cf61955..7878608 100644
--- a/server/services/sonarr.ts
+++ b/server/services/sonarr.ts
@@ -1,3 +1,4 @@
+import { error as logError, warn } from "../lib/log";
 import { normalizeLanguage } from "./jellyfin";
 
 export interface SonarrConfig {
@@ -26,23 +27,39 @@ interface SonarrSeries {
 	originalLanguage?: { name: string };
 }
 
-/** Returns ISO 639-2 original language for a series or null. */
-export async function getOriginalLanguage(cfg: SonarrConfig, tvdbId: string): Promise<string | null> {
+async function fetchJson<T>(url: string, cfg: SonarrConfig, context: string): Promise<T | null> {
 	try {
-		const res = await fetch(`${cfg.url}/api/v3/series?tvdbId=${tvdbId}`, {
-			headers: headers(cfg.apiKey),
-		});
-		if (!res.ok) return null;
-
-		const list = (await res.json()) as SonarrSeries[];
-		const series = list[0];
-		if (!series?.originalLanguage) return null;
-		return languageNameToCode(series.originalLanguage.name) ?? null;
-	} catch {
+		const res = await fetch(url, { headers: headers(cfg.apiKey) });
+		if (!res.ok) {
+			warn(`Sonarr ${context} → HTTP ${res.status} (${url.replace(cfg.apiKey, "***")})`);
+			return null;
+		}
+		return (await res.json()) as T;
+	} catch (e) {
+		logError(`Sonarr ${context} failed:`, e);
 		return null;
 	}
 }
 
+/** Returns ISO 639-2 original language for a series or null. */
+export async function getOriginalLanguage(cfg: SonarrConfig, tvdbId: string): Promise<string | null> {
+	// 1. Library: only hits series actively managed in Sonarr.
+	const list = await fetchJson<SonarrSeries[]>(`${cfg.url}/api/v3/series?tvdbId=${tvdbId}`, cfg, "library/tvdb");
+	const series = list?.[0];
+	if (series?.originalLanguage) return nameToIso(series.originalLanguage.name);
+
+	// 2. Metadata lookup via Sonarr's TVDB bridge for series not in the library.
+	const lookup = await fetchJson<SonarrSeries[]>(
+		`${cfg.url}/api/v3/series/lookup?term=tvdb%3A${tvdbId}`,
+		cfg,
+		"lookup/tvdb",
+	);
+	const fromLookup = lookup?.find((s) => String(s.tvdbId ?? "") === String(tvdbId)) ?? lookup?.[0];
+	if (fromLookup?.originalLanguage) return nameToIso(fromLookup.originalLanguage.name);
+
+	return null;
+}
+
 const NAME_TO_639_2: Record<string, string> = {
 	english: "eng",
 	french: "fra",
@@ -53,9 +70,12 @@ const NAME_TO_639_2: Record<string, string> = {
 	japanese: "jpn",
 	korean: "kor",
 	chinese: "zho",
+	mandarin: "zho",
+	cantonese: "zho",
 	arabic: "ara",
 	russian: "rus",
 	dutch: "nld",
+	flemish: "nld",
 	swedish: "swe",
 	norwegian: "nor",
 	danish: "dan",
@@ -70,13 +90,29 @@ const NAME_TO_639_2: Record<string, string> = {
 	greek: "ell",
 	hebrew: "heb",
 	persian: "fas",
+	farsi: "fas",
 	ukrainian: "ukr",
 	indonesian: "ind",
 	malay: "msa",
 	vietnamese: "vie",
+	catalan: "cat",
+	tamil: "tam",
+	telugu: "tel",
+	icelandic: "isl",
+	croatian: "hrv",
+	bulgarian: "bul",
+	serbian: "srp",
+	slovak: "slk",
+	slovenian: "slv",
+	latvian: "lav",
+	lithuanian: "lit",
+	estonian: "est",
 };
 
-function languageNameToCode(name: string): string | null {
+function nameToIso(name: string): string | null {
 	const key = name.toLowerCase().trim();
-	return NAME_TO_639_2[key] ?? normalizeLanguage(key.slice(0, 3)) ?? null;
+	if (NAME_TO_639_2[key]) return NAME_TO_639_2[key];
+	if (key.length === 2 || key.length === 3) return normalizeLanguage(key);
+	warn(`Sonarr language name not recognised: '${name}'.`);
+	return null;
 }