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The relationship between Sarah and John Barnaby (Fiona Dolman, Neil Dudgeon) and their dog Sykes helps lighten the mood on "Midsomer Murders." The latest set of feature-length episodes is now on Blu-ray and DVD.

The latest set of “Midsomer Murders” episodes leads these TV shows that are new this week on Blu-ray and DVD.

“Midsomer Murders: Set 24” (Acorn/Blu-ray/DVD, 2012, three discs, three feature-length episodes, text biography). Neil Dudgeon has settled in nicely after taking over this series from longtime star John Nettles, and his storylines with his wife and dog provide some welcome gentle humor. And there’s a surprise in store for the couple in this set.

Chief Inspector Barnaby (Dudgeon) and his partner Sgt. Jones (Jason Hughes) investigate the death of an amateur astronomer, a killer who leaves chess clues at the scenes of his crimes and a series of murders in and around a dairy that is having financial problems. Watch out for the killer cheese. (Sadly, the third episode marks Hughes’ last with the show.)

“Secret State” (Acorn/DVD, 2012, two discs, four episodes). Gabriel Byrne stars in this British miniseries as a deputy prime minister investigating an industrial accident that has killed 19 people. But when the prime minister is killed in a plane crash, he is thrust into a political power struggle and uncovers a conspiracy that runs deep. Based on Chris Mullin’s novel “A Very British Coup."

“Mystery Science Theater 3000: XXX” (Shout!/DVD, 1990-99, four discs, four episodes, featurettes, extended trailer/music video, four mini-posters). Four more episodes make their DVD debut as the gang skewers four Z-grade horror/sci-fi movies: “The Black Scorpion” (1957, b/w), “Outlaw of Gor” (1989), “The Projected Man” (1967) and “It Lives By Night” (1974).

“Babar and the Adventures of Badou: Gone Wild” (eOneDVD, 2011, eight episodes). These episodes are from the Canadian/French animated series of the title, a sequel of sorts to the earlier “Babar” series, this one focusing on Babar the elephant’s 8-year-old grandson, Badou, and his jungle adventures.

“Power Rangers Megaforce: A Battle to the Finish” (Lionsgate/DVD, 2013, four episodes, art gallery on Zords). The final episodes of the 20th season of the “Power Rangers” franchise focuses on battling enemies in an impending alien invasion.

“Adventure Time: Princess Day” (CN/Warner/DVD, 2010-14, 16 episodes, featurette). Cartoon Network’s offbeat animated series about a boy and his magical dog. Episodes from Seasons 2-4 focus on princesses, including “Princess Monster Wife,” “Princess Potluck,” “Beautopia” and the new title episode that won’t air until after this DVD release.

“My Little Pony: Friendship Is Magic: Keys of Friendship” (Shout! Kids/Hasbro/DVD, 2014, five episodes, sing-along). Included here is the two-part “Twilight’s Kingdom,” in which newly crowned princess Twilight Sparkle tries to figure out how to run Equestria even as a villain named Trek attempts an overthrow.

“Bubble Guppies: Get Ready for School!” (Nickelodeon/Paramount/DVD, 2014, six episodes, two music videos). The episodes are aimed at children preparing to return to school. Episodes include Avi’s first day of school, a substitute teacher who’s a real grump, a lost library card, etc. For ages 3 and up.

Chris Hicks is the author of "Has Hollywood Lost Its Mind? A Parent’s Guide to Movie Ratings." He also writes at www.hicksflicks.com and can be contacted at hicks@deseretnews.com.