Nearly 100 stars from television’s formative years bring their stories to PBS in a revealing four-part documentary series, Pioneers of Television on PBS. Each of the new one-hour episodes focuses on a different genre: sitcoms, late night, variety and game shows. Melding compelling new HD interviews with irresistible archival clips, Pioneers of Television offers a fresh take on television’s first celebrities, including Dick Van Dyke, Mary Tyler Moore, Andy Griffith, Betty White, Regis Philbin, Phyllis Diller, Dick Cavett, Tony Orlando, Marlo Thomas, Jonathan Winters, Ed McMahon, Bob Barker, Tommy Smothers and the late Merv Griffin, among others.

These landmark one-hour specials tell fascinating stories, reveal never-before-seen images and showcase timeless clips that still entertain decades later. The Pioneers of Television series covers:

• “Sitcoms”
This episode focuses on five key sitcoms: “I Love Lucy,” “The Honeymooners,” “Make Room for Daddy,” “The Andy Griffith Show” and “The Dick Van Dyke Show.” The last remaining Honeymooner, Joyce Randolph, offers surprising insights into the mind of Jackie Gleason. Similarly, Marlo Thomas speaks candidly about her father, Danny. Andy Griffith offers forceful opinions about the people and techniques that made his show work. In a rare occurrence, both Mary Tyler Moore and Dick Van Dyke recount their years on “The Dick Van Dyke Show.” Hundreds of episodes were culled for the most entertaining clips — including one particularly side-splitting bit by Don Knotts.

• “Variety”
This episode begins with Ed Sullivan’s “Toast of the Town” and Milton Berle’s “Texaco Star Theater” and progresses through “The Carol Burnett Show,” “Smothers Brothers” and “Laugh-In,” among others. Tim Conway and Jonathan Winters tell hilarious stories about their variety show years. Conversely, Pat Boone offers chilling insight into early TV’s unspoken racism, and Tommy Smothers details the compelling behind-the-scenes story of his landmark show. Tony Orlando wraps up the era with especially insightful comments about the genre. The episode includes fresh bites from Pioneers’ earlier interviews with Milton Berle, Red Skelton and Sid Caesar. There’s no shortage of great clips for this episode; standouts include Flip Wilson in a hilarious turn as Geraldine.