The show where famed astronomer Carl Sagan first made the phrase "billions and billions of (fill in the blank)" a part of popular culture is coming back to TV.

Sagan was usually referring to stars — or galaxies — when he spoke the phrase, but it was subsequently adopted in countless variations over the years, often with the speaker mimicking Sagan in a Johnny Carson-like voice. Now, the original version can be heard firsthand as part of a special marathon presentation of Sagan’s legendary series, "Cosmos: A Personal Voyage," this weekend on National Geographic Channel.

The event is part of the runup to the channel’s launch of its new series "Cosmos: A Spacetime Odyssey." All 13 episodes of the original Sagan program, which premiered in September 1980, will air on Nat Geo Saturday and Sunday (noon-6 p.m. Saturday and noon-7 p.m. Sunday), followed by the premiere of "Cosmos: A Spacetime Odyssey, hosted by astrophysicist Dr. Neil deGrasse Tyson, this Sunday, March 9, from 9-10 p.m. across multiple U.S. Fox networks.

The company announced that participating networks will be Fox Broadcasting, National Geographic Channel, Nat Geo WILD, Nat Geo MUNDO, FX, FXX, FXM, FOX Sports 1, FOX Sports 2 and FOX Life.

Please click here to see a full schedule of individual episodes for the Sagan series, along with additional details about both the original program and the new series, in the full press release from Nat Geo.

Carl Sagan