Patrick Duffy is best known for his role as Bobby Ewing on the CBS primetime soap Dallas. He played the youngest son of Miss Ellie and the nicest brother of J.R. Ewing from 1978 to 1985 and from 1986 to 1991. Duffy returned to reprise his role as Bobby in a continuation of Dallas, which aired on TNT from 2012 to 2014. He is also well known for his role on the ABC sitcom Step by Step as Frank Lambert, from 1991 to 1998.

Read more on Patrick Duffy Interview: "Dallas" Star Talks Hallmark's "The Mistletoe Secret"…

Dawn Wells became known for her role as Mary Ann Summers on the CBS sitcom Gilligan’s Island. Wells’ character, Mary Ann, who was originally listed as “And the rest” in the credits, became the fan favorite, garnering more fan mail than the title character. Her other TV credits include Wagon Train, Maverick, Bonanza, The New Joey Bishop Show, Gilligan’s Planet, Baywatch, Space Ghost Coast to Coast, Surviving Gilligan’s Island, The Bold and the Beautiful and The Epic Tales of Captain Underpants.

Read more on Dawn Wells Interview: Celebrating 55 Years of America's Favorite Shipwreck…

Seventeen-year-old Sophia Lillis is known for her role as Beverly Marsh in the horror film It (2017), the film adaptation of Stephen King’s 1986 novel of the same name and also as the young version of Camille Preaker in HBO’s psychological thriller Sharp Objects, which was played by Amy Adams as an adult.

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Michael Learned is known for her role as Olivia Walton in The Waltons, a TV series created by Earl Hamner, Jr., based on his book Spencer’s Mountainand a 1963 film of the same name, about a family in rural Virginia during the Great Depression and World War II. The show also stars Richard Thomas, Ralph Waite, Ellen Corby, Will Geer, Judy Norton, Jon Walmsley, Mary Elizabeth McDonough, Eric Scott, David W. Harper and Kami Cotler.

Read more on Michael Learned Interview: "The Waltons" Star Honored with Oscar Icon Award for Television…