diff --git a/.github/workflows/validate-tvdb-seasons.yml b/.github/workflows/validate-tvdb-seasons.yml
new file mode 100644
index 0000000..cfbeec9
--- /dev/null
+++ b/.github/workflows/validate-tvdb-seasons.yml
@@ -0,0 +1,48 @@
+name: Validate TVDB Seasons
+on:
+  pull_request_target:
+    branches:
+      - main
+    paths:
+      - "series-tvdb.en.yaml"
+      - "**.py"
+env:
+  PYTHON_VERSION: "3.10"
+jobs:
+  validate-added-seasons-against-tvdb:
+    runs-on: ubuntu-latest
+    steps:
+    # TODO: maybe make this step a pre-requisite to any CI flow
+    - name: Prevent file change
+      uses: xalvarez/prevent-file-change-action@v1
+      with:
+        githubToken: ${{ secrets.GITHUB_TOKEN }}
+        pattern: .*\.py
+        trustedAuthors: evie-lau,Soitora,reconman
+        allowNewFiles: false
+    - uses: actions/checkout@v4
+      with:
+        fetch-depth: 0
+        ref: ${{github.event.pull_request.head.ref}}
+        repository: ${{github.event.pull_request.head.repo.full_name}}
+    - name: Set up Python ${{ env.PYTHON_VERSION }}
+      uses: actions/setup-python@v5
+      with:
+        python-version: ${{ env.PYTHON_VERSION }}
+    - name: Cache python env
+      uses: actions/cache@v4
+      with:
+        path: ${{ env.pythonLocation }}
+        key: ${{ env.pythonLocation }}-${{ hashFiles('validate-tvdb-seasons.py') }}
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip
+        python -m pip install tvdb_v4_official python-dotenv pyyaml deepdiff
+    - name: Run season validation against TVDB
+      env:
+        TVDB_API_KEY: ${{ secrets.TVDB_API_KEY }}
+      run: python validate-tvdb-seasons.py
+    - name: Create updated entries list
+      uses: actions/upload-artifact@v4
+      with:
+        path: temp.yaml
\ No newline at end of file
diff --git a/series-tmdb.en.yaml b/series-tmdb.en.yaml
index cafd2df..782056a 100644
--- a/series-tmdb.en.yaml
+++ b/series-tmdb.en.yaml
@@ -2331,6 +2331,15 @@ entries:
       - season: 1
         anilist-id: 150972
 
+  - title: "SAKAMOTO DAYS"
+    guid: "plex://show/62ea662444a4745bb2f3a8ce"
+    # imdb: https://www.imdb.com/title/tt17069148/
+    # tmdb: https://www.themoviedb.org/tv/207332
+    # tvdb: https://www.thetvdb.com/dereferrer/series/423732
+    seasons:
+      - season: 1
+        anilist-id: 177709
+
   - title: "Scott Pilgrim Takes Off"
     guid: plex://show/61dd97c364b2acfab575e1c3
     # imdb: https://www.imdb.com/title/tt16969708/
@@ -3175,6 +3184,21 @@ entries:
       - season: 5
         anilist-id: 142481
 
+  - title: "Yu Yu Hakusho"
+    guid: "plex://show/5d9c0813705e7a001e6d1afb"
+    # imdb: https://www.imdb.com/title/tt0185133/
+    # tmdb: https://www.themoviedb.org/tv/30669
+    # tvdb: https://www.thetvdb.com/dereferrer/series/76665
+    seasons:
+      - season: 1
+        anilist-id: 392
+      - season: 2
+        anilist-id: 392
+      - season: 3
+        anilist-id: 392
+      - season: 4
+        anilist-id: 392
+
   - title: "Yu-Gi-Oh! Duel Monsters"
     guid: plex://show/5d9c081dba6eb9001fb9c35c
     # imdb: https://www.imdb.com/title/tt0247902/
@@ -3218,3 +3242,12 @@ entries:
       - season: 1
         anilist-id: 159831
 
+  - title: "Übel Blatt"
+    guid: "plex://show/65db309639d5eabf6d1e207b"
+    # imdb: https://www.imdb.com/title/tt32581027/
+    # tmdb: https://www.themoviedb.org/tv/247367
+    # tvdb: https://www.thetvdb.com/dereferrer/series/446485
+    seasons:
+      - season: 1
+        anilist-id: 175198
+
diff --git a/series-tvdb.en.yaml b/series-tvdb.en.yaml
index b0f19de..92c808b 100644
--- a/series-tvdb.en.yaml
+++ b/series-tvdb.en.yaml
@@ -738,7 +738,7 @@ entries:
       - season: 9
         anilist-id: 813
 
-  - title: "Drop Kick on My Devil!!"
+  - title: "Dropkick on My Devil!!"
     guid: plex://show/5d9c090502391c001f59412a
     seasons:
       - season: 1
@@ -2375,6 +2375,15 @@ entries:
       - season: 1
         anilist-id: 150972
 
+  - title: "SAKAMOTO DAYS"
+    guid: "plex://show/62ea662444a4745bb2f3a8ce"
+    # imdb: https://www.imdb.com/title/tt17069148/
+    # tmdb: https://www.themoviedb.org/tv/207332
+    # tvdb: https://www.thetvdb.com/dereferrer/series/423732
+    seasons:
+      - season: 1
+        anilist-id: 177709
+
   - title: "Scott Pilgrim Takes Off"
     guid: plex://show/61dd97c364b2acfab575e1c3
     # imdb: https://www.imdb.com/title/tt16969708/
@@ -3231,6 +3240,21 @@ entries:
       - season: 5
         anilist-id: 142481
 
+  - title: "Yu Yu Hakusho"
+    guid: "plex://show/5d9c0813705e7a001e6d1afb"
+    # imdb: https://www.imdb.com/title/tt0185133/
+    # tmdb: https://www.themoviedb.org/tv/30669
+    # tvdb: https://www.thetvdb.com/dereferrer/series/76665
+    seasons:
+      - season: 1
+        anilist-id: 392
+      - season: 2
+        anilist-id: 392
+      - season: 3
+        anilist-id: 392
+      - season: 4
+        anilist-id: 392
+
   - title: "Yu-Gi-Oh! Duel Monsters"
     guid: plex://show/5d9c081dba6eb9001fb9c35c
     # imdb: https://www.imdb.com/title/tt0247902/
@@ -3282,3 +3306,12 @@ entries:
       - season: 1
         anilist-id: 159831
 
+  - title: "Übel Blatt"
+    guid: "plex://show/65db309639d5eabf6d1e207b"
+    # imdb: https://www.imdb.com/title/tt32581027/
+    # tmdb: https://www.themoviedb.org/tv/247367
+    # tvdb: https://www.thetvdb.com/dereferrer/series/446485
+    seasons:
+      - season: 1
+        anilist-id: 175198
+
diff --git a/validate-tvdb-seasons.py b/validate-tvdb-seasons.py
new file mode 100644
index 0000000..28c819c
--- /dev/null
+++ b/validate-tvdb-seasons.py
@@ -0,0 +1,130 @@
+import os, sys, subprocess
+import tvdb_v4_official, yaml
+from dotenv import load_dotenv
+from deepdiff import DeepDiff
+
+
+# Get TVDB ID and series information for a show
+def getTvdbEntry(showName):
+    # Get TVDB ID of show
+    showId = None
+    series = None
+    searchResults = tvdb.search(showName, type="series")
+    for result in searchResults:
+        if (resultMatchesShow(result, showName)):
+            # print(result)
+            showId = result['tvdb_id']
+            series = tvdb.get_series_extended(showId)
+            # only mark as found if it's an Anime show
+            if matchesAnimeCriteria(series):
+                break
+            else: # reset stored values if not a match
+                showId = None
+                series = None
+    return showId, series
+
+
+# Check if showName matches anything result name, aliases, or translation names
+def resultMatchesShow(result, showName):
+    # TODO: need to normalize some characters, such as dashes and apostrophes. Use unicodedata.normalize. Test with "KonoSuba – God's blessing on this wonderful world!!" (curly vs straight apostrophe)
+    return ((showName == result['name']) or
+            ('aliases' in result and showName in result['aliases']) or
+            ('translations' in result and showName in result['translations'].values()))
+
+
+# Match for AniList anime criteria (arbitrary): genre=[Anime,Animation], country=[jpn,kor,chn,twn]
+validGenres = {'Anime','Animation'}
+validCountries = {'jpn','kor','chn','twn'}
+def matchesAnimeCriteria(series):
+    seriesGenreSet = {item['name'] for item in series['genres']}
+    return ((seriesGenreSet.intersection(validGenres)) and
+            (series['originalCountry'] in validCountries))
+
+
+# Validate user-mapped season entries against TVDB seasons
+def validateShowSeasons(showName, seasonsToFind):
+    errors = 0
+
+    showId, series = getTvdbEntry(showName)
+    print("Validating: " + showName + " [" + str(showId) + "] - Seasons " + str(seasonsToFind))
+
+    if (showId is None):
+        print("\t[WARNING] No TVDB series result: " + showName)
+        return errors
+    # TODO: does not work for primary_type: movie, maybe separate method for those? Test with 5cm per second
+    tvdbSeasons = [season['number'] for season in series['seasons'] if season['type']['type'] == 'official']
+
+    # print("Found show: " + showName + " (" + showId + "), with seasons: " + str(tvdbSeasons))
+    # print("Validating user-mapped seasons: " + str(seasonsToFind))
+    invalidSeasons = []
+    for s in seasonsToFind:
+        if s not in tvdbSeasons:
+            errors += 1
+            invalidSeasons.append(s)
+
+    if errors > 0:
+        print("\t[ERROR] Did not find season(s): " + str(invalidSeasons) + " in show: " + showName)
+    return errors
+
+
+# Parse temp.yaml and validate shows/seasons against TVDB
+def validateMappings(file="temp.yaml"):
+    errors = 0
+    with open(file, mode='r') as f:
+        mappings = yaml.safe_load(f)
+        for show in sorted(mappings['entries'], key=lambda entry: (entry['title'], entry['seasons'])):
+            showName = show['title']
+            seasons = set([s['season'] for s in show['seasons'] if 'season' in s])
+            errors += validateShowSeasons(showName, seasons)
+    return errors
+
+
+# Finds new and changed entries and writes them into a temp yaml file
+def extractNewMappings():
+    old_mappings = dict()
+    new_mappings = dict()
+
+    # get old version of TVDB file
+    # TODO read old_mappings YAML from stdout so the file is not needed anymore
+    with open('tvdb-old.yaml', mode='w') as f:
+        subprocess.run(
+            ['git', 'show', 'origin/main:series-tvdb.en.yaml'],
+            text=True,
+            check=True,
+            stdout=f
+        )
+
+    with open('tvdb-old.yaml', mode='r') as f:
+        old_mappings = yaml.safe_load(f)
+
+    with open('series-tvdb.en.yaml', mode='r') as f:
+        new_mappings = yaml.safe_load(f)
+
+    # create new mapping file with just the changed entries
+    diff = DeepDiff(old_mappings['entries'], new_mappings['entries'], ignore_order=True)
+    change_groups = { "entries": [] }
+    # diff.affected_root_keys contains the indices of the changed entries
+    for key in diff.affected_root_keys:
+        change_groups['entries'].append(new_mappings['entries'][key])
+
+    # write the changed entries to temp.yaml
+    with open('temp.yaml', mode='w') as file:
+        yaml.dump(change_groups, file, encoding='utf-8', allow_unicode=True)
+
+
+def cleanup():
+    os.remove("tvdb-old.yaml")
+    os.remove("temp.yaml")
+
+
+# TODO: cross reference anilist-id show name
+extractNewMappings()
+# Load API Key and initialize tvdb
+load_dotenv()
+apikey = os.getenv("TVDB_API_KEY")
+tvdb = tvdb_v4_official.TVDB(apikey)
+
+errors = validateMappings()
+if errors != 0:
+    sys.exit("Found " + str(errors) + " error(s) in the season mappings")
+cleanup()
\ No newline at end of file