Question: The animated Christmas television special that included the song "Christmas Time Is Here" is based on what comic strip?

Context articles: The Little Troll Prince
Christmas Comes to Pac-Land
Christmas Time Is Here
A Charlie Brown Christmas (soundtrack)
Holidaze: The Christmas That Almost Didn't Happen
A Chipmunk Christmas
Bill the Cat
Yogi Bear's All Star Comedy Christmas Caper
A Flintstone Christmas
A Charlie Brown Christmas

The Little Troll Prince (onscreen title: The Little Troll Prince: A Christmas Parable) is a 1987 animated Christmas television special produced by Hanna-Barbera.
 Backed by the International Lutheran Laymen's League, it has strong Christian themes of unconditional love, self-sacrifice, and redemption, with a substantial Protestant influence.
 The story was a written parable script for the Christmas special with a lesson about the feeling of joy and love in one's heart, that can lead one from a cruel world to a light-hearted world.
Christmas Comes to Pac-Land is a 1982 animated Christmas television special and spin-off of the Saturday morning animated series "Pac-Man" based on the video game, produced by Hanna-Barbera.
 It premiered in prime time on ABC on December 16, 1982.
"Christmas Time Is Here" is a popular Christmas song written by Lee Mendelson and Vince Guaraldi for the 1965 TV special "A Charlie Brown Christmas", one of the first animated Christmas specials produced for network TV in the United States.
 Because the song became a hit, two versions were included on the album "A Charlie Brown Christmas": an instrumental version by the Vince Guaraldi Trio and a vocal version by children from St. Paul's Episcopal Church in San Rafael, California.
A Charlie Brown Christmas is a 1965 studio album by American composer/conductor Vince Guaraldi (later credited to the jazz group the Vince Guaraldi Trio).
 The album was released in December 1965 in the United States by Fantasy Records.
 It is the soundtrack to the CBS Christmas television special of the same name.
 Guaraldi was contacted by television producer Lee Mendelson several years prior to compose music for a documentary on the comic strip "Peanuts" and its creator, Charles M. Schulz.
 Although the special went unaired, these selections were released in 1964 as "Jazz Impressions of "A Boy Named Charlie Brown"".
 Coca-Cola commissioned a Christmas special based on "Peanuts" in 1965 and Guaraldi returned to score the special.
Holidaze: The Christmas That Almost Didn't Happen is an American stop-motion animated Christmas television special directed by David H. Brooks, that originally aired in 2006 and produced by BixPix Entertainment, Once Upon a Frog and Madison Street Entertainment.
 The show's plot has Rusty Reindeer (Fred Savage) the brother of Rudolph the Red Nosed Reindeer joining a support group for depressed holiday icons, and he and the other characters search for the meaning of Christmas and help a young boy (Dylan and Cole Sprouse) to get on Santa's nice list.
 Rusty's cohorts include Candie, the Easter Bunny (Gladys Knight); Mr. C, the grouchy cherub (Paul Rodriguez); Albert, the Thanksgiving Turkey (Harland Williams); And Trick and Treat (Brenda Song and Emily Osment) the teenage Halloween Ghosts.
A Chipmunk Christmas is an animated Christmas television special based on characters from "Alvin and the Chipmunks".
 Produced by Bagdasarian Productions in association with Chuck Jones Enterprises, it aired on the NBC television network in 1981, nine years after the death of "Alvin and the Chipmunks" creator Ross Bagdasarian, Sr. (also known as David Seville).
 This was the first time that Alvin, Simon and David Seville were voiced by Ross Bagdasarian, Jr. and the first time that Theodore was voiced by Janice Karman.
Bill the Cat, or Bill D. Cat, is a fictional cat appearing in the works of cartoonist Berkeley Breathed, beginning with the comic strip "Bloom County" in the 1980s and continuing in "Outland" and "Opus" in the following decades.
 Bill also appeared in some of Breathed's illustrated children's books, including "A Wish for Wings That Work", which was also made into an animated Christmas television special, and also on greeting cards and other sundry merchandise.
 The cat's most frequent spoken sentiments are "Ack!"
 and "Thppt!"
, unlike most other animals (and children) in Breathed's work, who not only can speak English, but have advanced vocabularies.
 The former is a result of his regularly choking on hairballs, the latter sound an approximation of the "raspberry".
Yogi Bear's All Star Comedy Christmas Caper is a 1982 animated Christmas television special starring Yogi Bear.
 It is the third and final Yogi Christmas special.
 Produced by Hanna-Barbera, it first aired on  21, 1982 (1982--) on CBS.
A Flintstone Christmas is a 1977 animated Christmas television special featuring characters from "The Flintstones" franchise.
 It was produced by Hanna-Barbera and is the second Christmas-themed animated work in the franchise, after the 1964 episode "Christmas Flintstone."
 Both feature the character Fred Flintstone taking on the role of Santa Claus.
A Charlie Brown Christmas is a 1965 animated television special based on the comic strip "Peanuts", by Charles M. Schulz.
 Produced by Lee Mendelson and directed by Bill Melendez, the program made its debut on CBS on December 9, 1965.
 In the special, lead character Charlie Brown finds himself depressed despite the onset of the cheerful holiday season.
 Lucy suggests he direct a neighborhood Christmas play, but his best efforts are ignored and mocked by his peers.
 After Linus tells Charlie Brown about the true meaning of Christmas, Charlie Brown cheers up, and the Peanuts gang unites to celebrate the Christmas season.