New: Support import list lookup by TMDb ID

src/NzbDrone.Core/ImportLists/ImportListSyncService.cs

@@ -90,7 +90,7 @@ namespace NzbDrone.Core.ImportLists
 
                 var importList = importLists.Single(x => x.Id == item.ImportListId);
 
-                // Map by IMDbId if we have it
+                // Map by IMDb ID if we have it
                 if (item.TvdbId <= 0 && item.ImdbId.IsNotNullOrWhiteSpace())
                 {
                     var mappedSeries = _seriesSearchService.SearchForNewSeriesByImdbId(item.ImdbId)
@@ -103,7 +103,20 @@ namespace NzbDrone.Core.ImportLists
                     }
                 }
 
-                // Map by AniListId if we have it
+                // Map by TMDb ID if we have it
+                if (item.TvdbId <= 0 && item.TmdbId > 0)
+                {
+                    var mappedSeries = _seriesSearchService.SearchForNewSeriesByTmdbId(item.TmdbId)
+                        .FirstOrDefault();
+
+                    if (mappedSeries != null)
+                    {
+                        item.TvdbId = mappedSeries.TvdbId;
+                        item.Title = mappedSeries?.Title;
+                    }
+                }
+
+                // Map by AniList ID if we have it
                 if (item.TvdbId <= 0 && item.AniListId > 0)
                 {
                     var mappedSeries = _seriesSearchService.SearchForNewSeriesByAniListId(item.AniListId)

src/NzbDrone.Core/ImportLists/Rss/Plex/PlexRssImportParser.cs

@@ -44,6 +44,11 @@ namespace NzbDrone.Core.ImportLists.Rss.Plex
                 {
                     info.TvdbId = tvdbId;
                 }
+
+                if (int.TryParse(guid.Replace("tmdb://", ""), out var tmdbId))
+                {
+                    info.TmdbId = tvdbId;
+                }
             }
 
             if (info.ImdbId.IsNullOrWhiteSpace() && info.TvdbId == 0)

src/NzbDrone.Core/MetadataSource/ISearchForNewSeries.cs

@@ -8,5 +8,6 @@ namespace NzbDrone.Core.MetadataSource
         List<Series> SearchForNewSeries(string title);
         List<Series> SearchForNewSeriesByImdbId(string imdbId);
         List<Series> SearchForNewSeriesByAniListId(int aniListId);
+        List<Series> SearchForNewSeriesByTmdbId(int tmdbId);
     }
 }

src/NzbDrone.Core/MetadataSource/SkyHook/SkyHookProxy.cs

@@ -90,6 +90,13 @@ namespace NzbDrone.Core.MetadataSource.SkyHook
             return results;
         }
 
+        public List<Series> SearchForNewSeriesByTmdbId(int tmdbId)
+        {
+            var results = SearchForNewSeries($"tmdb:{tmdbId}");
+
+            return results;
+        }
+
         public List<Series> SearchForNewSeries(string title)
         {
             try