diff --git a/src/NzbDrone.Core.Test/MediaFiles/EpisodeImport/Specifications/MatchesGrabSpecificationFixture.cs b/src/NzbDrone.Core.Test/MediaFiles/EpisodeImport/Specifications/MatchesGrabSpecificationFixture.cs
new file mode 100644
index 000000000..6dae08e61
--- /dev/null
+++ b/src/NzbDrone.Core.Test/MediaFiles/EpisodeImport/Specifications/MatchesGrabSpecificationFixture.cs
@@ -0,0 +1,119 @@
+using System.Collections.Generic;
+using FizzWare.NBuilder;
+using FluentAssertions;
+using Moq;
+using NUnit.Framework;
+using NzbDrone.Core.Download;
+using NzbDrone.Core.History;
+using NzbDrone.Core.MediaFiles.EpisodeImport.Specifications;
+using NzbDrone.Core.Parser.Model;
+using NzbDrone.Core.Test.Framework;
+using NzbDrone.Core.Tv;
+using NzbDrone.Test.Common;
+
+namespace NzbDrone.Core.Test.MediaFiles.EpisodeImport.Specifications
+{
+    [TestFixture]
+    public class MatchesGrabSpecificationFixture : CoreTest<MatchesGrabSpecification>
+    {
+        private Episode _episode1;
+        private Episode _episode2;
+        private Episode _episode3;
+        private LocalEpisode _localEpisode;
+        private DownloadClientItem _downloadClientItem;
+
+        [SetUp]
+        public void Setup()
+        {
+            _episode1 = Builder<Episode>.CreateNew()
+                .With(e => e.Id = 1)
+                .Build();
+
+            _episode2 = Builder<Episode>.CreateNew()
+                .With(e => e.Id = 2)
+                .Build();
+
+            _episode3 = Builder<Episode>.CreateNew()
+                .With(e => e.Id = 3)
+                .Build();
+
+            _localEpisode = Builder<LocalEpisode>.CreateNew()
+                                                 .With(l => l.Path = @"C:\Test\Unsorted\Series.Title.S01E01.720p.HDTV-Sonarr\S01E05.mkv".AsOsAgnostic())
+                                                 .With(l => l.Episodes = new List<Episode> { _episode1 })
+                                                 .Build();
+
+            _downloadClientItem = Builder<DownloadClientItem>.CreateNew().Build();
+        }
+
+        private void GivenHistoryForEpisodes(params Episode[] episodes)
+        {
+            var history = new List<EpisodeHistory>();
+
+            foreach (var episode in episodes)
+            {
+                history.Add(Builder<EpisodeHistory>.CreateNew()
+                    .With(h => h.EventType = EpisodeHistoryEventType.Grabbed)
+                    .With(h => h.EpisodeId = episode.Id)
+                    .Build());
+            }
+
+            Mocker.GetMock<IHistoryService>()
+                  .Setup(s => s.FindByDownloadId(It.IsAny<string>()))
+                  .Returns(history);
+        }
+
+        [Test]
+        public void should_be_accepted_for_existing_file()
+        {
+            _localEpisode.ExistingFile = true;
+
+            Subject.IsSatisfiedBy(_localEpisode, null).Accepted.Should().BeTrue();
+        }
+
+        [Test]
+        public void should_be_accepted_if_no_download_client_item()
+        {
+            Subject.IsSatisfiedBy(_localEpisode, null).Accepted.Should().BeTrue();
+        }
+
+        [Test]
+        public void should_be_accepted_if_no_grab_history()
+        {
+            GivenHistoryForEpisodes();
+
+            Subject.IsSatisfiedBy(_localEpisode, _downloadClientItem).Accepted.Should().BeTrue();
+        }
+
+        [Test]
+        public void should_be_accepted_if_file_episode_matches_single_grab_history()
+        {
+            GivenHistoryForEpisodes(_episode1);
+
+            Subject.IsSatisfiedBy(_localEpisode, _downloadClientItem).Accepted.Should().BeTrue();
+        }
+
+        [Test]
+        public void should_be_accepted_if_file_episode_is_in_multi_episode_grab_history()
+        {
+            GivenHistoryForEpisodes(_episode1, _episode2);
+
+            Subject.IsSatisfiedBy(_localEpisode, _downloadClientItem).Accepted.Should().BeTrue();
+        }
+
+        [Test]
+        public void should_be_rejected_if_file_episode_does_not_match_single_grab_history()
+        {
+            GivenHistoryForEpisodes(_episode2);
+
+            Subject.IsSatisfiedBy(_localEpisode, _downloadClientItem).Accepted.Should().BeFalse();
+        }
+
+        [Test]
+        public void should_be_rejected_if_file_episode_is_not_in_multi_episode_grab_history()
+        {
+            GivenHistoryForEpisodes(_episode2, _episode3);
+
+            Subject.IsSatisfiedBy(_localEpisode, _downloadClientItem).Accepted.Should().BeFalse();
+        }
+    }
+}
diff --git a/src/NzbDrone.Core/MediaFiles/EpisodeImport/Specifications/MatchesGrabSpecification.cs b/src/NzbDrone.Core/MediaFiles/EpisodeImport/Specifications/MatchesGrabSpecification.cs
new file mode 100644
index 000000000..532103f17
--- /dev/null
+++ b/src/NzbDrone.Core/MediaFiles/EpisodeImport/Specifications/MatchesGrabSpecification.cs
@@ -0,0 +1,70 @@
+using System.Collections.Generic;
+using System.Linq;
+using NLog;
+using NzbDrone.Common.Extensions;
+using NzbDrone.Core.DecisionEngine;
+using NzbDrone.Core.Download;
+using NzbDrone.Core.History;
+using NzbDrone.Core.Parser;
+using NzbDrone.Core.Parser.Model;
+using NzbDrone.Core.Tv;
+
+namespace NzbDrone.Core.MediaFiles.EpisodeImport.Specifications
+{
+    public class MatchesGrabSpecification : IImportDecisionEngineSpecification
+    {
+        private readonly Logger _logger;
+        private readonly IParsingService _parsingService;
+        private readonly IHistoryService _historyService;
+
+        public MatchesGrabSpecification(IParsingService parsingService, IHistoryService historyService, Logger logger)
+        {
+            _logger = logger;
+            _parsingService = parsingService;
+            _historyService = historyService;
+        }
+
+        public Decision IsSatisfiedBy(LocalEpisode localEpisode, DownloadClientItem downloadClientItem)
+        {
+            if (localEpisode.ExistingFile)
+            {
+                return Decision.Accept();
+            }
+
+            if (downloadClientItem == null)
+            {
+                return Decision.Accept();
+            }
+
+            var grabbedHistory = _historyService.FindByDownloadId(downloadClientItem.DownloadId)
+                .Where(h => h.EventType == EpisodeHistoryEventType.Grabbed)
+                .ToList();
+
+            if (grabbedHistory.Empty())
+            {
+                return Decision.Accept();
+            }
+
+            var unexpected = localEpisode.Episodes.Where(e => grabbedHistory.All(o => o.EpisodeId != e.Id)).ToList();
+
+            if (unexpected.Any())
+            {
+                _logger.Debug("Unexpected episode(s) in file: {0}", FormatEpisode(unexpected));
+
+                if (unexpected.Count == 1)
+                {
+                    return Decision.Reject("Episode {0} was not found in the grabbed release: {1}", FormatEpisode(unexpected), grabbedHistory.First().SourceTitle);
+                }
+
+                return Decision.Reject("Episodes {0} were not found in the grabbed release: {1}", FormatEpisode(unexpected), grabbedHistory.First().SourceTitle);
+            }
+
+            return Decision.Accept();
+        }
+
+        private string FormatEpisode(List<Episode> episodes)
+        {
+            return string.Join(", ", episodes.Select(e => $"{e.SeasonNumber}x{e.EpisodeNumber:00}"));
+        }
+    }
+}