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When the Titanic goes down, Lord Grantham loses his heirs, and Mary loses her fiance.

Jamie Chung, Cyndi Lauper and Danny Trejo retrace the journeys of their immigrant ancestors.

Research into the ancestry of singer Lea Salonga and actress Amanda Seyfried reveals relatives who survived heart-wrenching ordeals.

Sign off.

Martin and Chris uncover a plot by Donita Donata to capture sea horses to make living jewelry.

Lotta is frustrated learning a new dance, but realizes it is ok to experience music in her own way; Sheldon worries about telling Carl that he doesn't want to play pirates anymore.

Daniel's rushing to go on a boat ride causes him to break his toy boat.

Phoebe and Jay are asked to bird sit; photo time leads Jay to an outfit disaster.

Big Bird is meeting Snuffy at Hooper's for lunch, and everyone decides to surprise him with a Snuffy-sized sandwich named after him, the Snuffwich.

Mr. E learns a dance for Friendship Day; Super, the Wombats and the Boo Boo Blimp to the rescue when the power goes out for the Friendship Daylight Show.

Donkey tries to act like a bird at Duck Duck's bird party, but she does not enjoy herself; Grampy and Donkey miss Gregory while he is away at camp.

Rosie and Javi's pirate adventure goes awry; Rosie has trouble choosing a job at the first Fun Club meeting.

Elinor, Olive and Ari disagree about the best way to build a couch cushion castle; when Ari misplaces the group's favorite ball, they discover that he needs a system for keeping track of his things.

Alma is consumed with her starring role in a musical; Alma and Harper have a playdate at the Rivera house.

Molly finds a lost baby beluga and tries to reunite it with its mother; Molly and Grandpa Nat try to retrieve Molly's fishing hat after it floats away.

James Braidwood explains to Brad that being prepared can help him stay calm when he is feeling nervous; Xavier and Yadina learn that being responsible can involve making hard choices.

Chef Marcel Desaulniers prepares oven-roasted plum cakes with chocolate sauce and chocolate-mint nightcaps.

Richard installs a whole house water filtration system; Tom walks Kevin through various types of woods; Ross visits a hotel room that's powered by voice activation; Jenn Nawada installs a bluestone patio with a reclaimed granite fire pit.

Madagascar, the strangest and oldest island on Earth, has seen more unique wildlife than any other island.

A Cartier Art Deco Tutti Frutti clutch circa 1925; a Carl Kauba cowboy bronze circa 1900; a Sumerian cuneiform tablet.

Green Bay Packers salesman's sample championship rings; Barbie dolls and wardrobe circa 1960; a 1977 Keith Haring Bean Salad lithograph.

A 1969 Woodstock jacket and program; a silk wedding gown circa 1875; Jane Peterson oil circa 1925; a visit to the International Balloon Museum.

Co-anchors Amna Nawaz and Geoff Bennett and correspondents offer in-depth analysis of current events.

Finds include a 1961 JFK Santa Claus Letter, a 1979 Ed Ruscha Stage Fright ink on paper and a John Juzek violin circa 1950.

An 1880 Celia Thaxter hand-painted vase; a 1964 Presidential Rolex with the box and papers; a Mary Elizabeth Price painted screen circa 1925.

Filmmaker Vicky Du traces her family's mental illness back to the Chinese Communist Revolution of 1949.

Christiane Amanpour leads discussions about world issues and interviews with global leaders.