An example of the use of both Cookie Monsters is Monsterpiece Theater: Twin Beaks, with one puppet for the Alistair Cookie scenes and the other for the storyline's "Agent Cookie. The Flute-Snatcher turned into a background monster from The Great Santa Claus Switch and The Muppet Show.

Cookie Monster is known to have a mother, father, a younger sister, a few cousins – Cousin Monster, Biscuit Monster, also Apple Monster, a cousin known from one episode. This team wanted to create a children's television show that would help young children prepare for school through entertainment and funny stories. The piece features the wave with googly eyes and cookies in the crest, resembling Cookie Monster eating cookies. Cookie Monster also claimed to have "crazy times during the '70s and '80s", referring to himself as "the Robert Downey Jr. This puppet prominently appears in chroma key scenes, including the Smart Cookies segments and " B is for Book.In a June 19, 2008, appearance on The Colbert Report, Cookie Monster again explained that "Cookies are a sometimes food.

Colbert had asked agitatedly why Cookie Monster had "abandoned the pro-cookie agenda" and thus caused fruit to become the favorite snack of American children, according to a study Colbert had heard.Cookie Monster's dad appeared in a ‘'Monsterpiece Theater'', sketch promoting energy conservation, water conservation, and environmentalism. He also has a father, who appeared in a Monsterpiece Theater sketch promoting energy conservation, water conservation and environmentalism. Two subtly different Cookie Monster puppets have been used interchangeably since the 1980s: One puppet (pictured at top) first appeared in season 16 and has a larger, wider mouth; the other (bottom), which appeared in Follow That Bird and thereafter, has a smaller, more curved mouth.

Cookie Monster refutes the rumor, explaining that he eats the fruit first, and then has cookies for dessert. Later segments feature Prairie Dawn trying to restrain Cookie's urges to devour the letter of the day, presented instead as actual foam letters.

In the song " Cookie", Cookie Monster revealed that his first word as a "cute little baby" was none other than "Cookie! As it turns out, these commercials were never aired — but all three monsters had a future in the Muppet cast. His signature song, " C Is For Cookie", was first aired during the 1971–72 season, and it became one of the best-known songs from Sesame Street.

The very first instance of Cookie Monster's lower body being shown is the Universal Studios Japan attraction Sesame Street 4-D Movie Magic, which did not get an American release until 2008.This puppet is also used for Cookie Monster's Mommy during " Me Gotta Be Blue" and an angel in " Don't Eat the Pictures. When asked by Wired whether he has a nose, Cookie Monster responded that "Me know that you no can see it, but me have nose. The guttural singing style in death metal bands is commonly (if facetiously) compared to Cookie Monster's low-pitched, gravelly voice. Other instances where Cookie's feet are shown include The Street We Live On (when he pretends to be a baby), episode 4075 (as he sits on a throne during his story), Abby in Wonderland and several editions of " Cookie's Crumby Pictures.