Question: The Wrecking Crew, released in December, 1968, and starring Dean Martin, an American singer, actor, comedian, and film producer, Martin was nicknamed what, for his seemingly effortless charisma and self-assurance?

full_context: Document 1: Danny Thomas: Amos Muzyad Yakhoob Kairouz (January 6, 1912 – February 6, 1991), known professionally by his stage name Danny Thomas, was an American nightclub comedian, singer, actor, and producer, whose career spanned five decades. He created and starred in one of the most successful and long running situation comedies in the history of American network television. In addition to guest roles on many of the comedy, talk and musical variety programs of his time, his legacy includes a lifelong dedication to fundraising for charity.
Document 2: For Those Who Think Young (film): For Those Who Think Young is a 1964 beach party film shot in Techniscope, directed by Leslie H. Martinson and featuring James Darren, Pamela Tiffin, Paul Lynde, Tina Louise, Bob Denver, Nancy Sinatra, Robert Middleton, Ellen Burstyn (billed as Ellen McRae), Claudia Martin and Woody Woodbury.
Document 3: Sextette: Sextette is a 1978 American comedy/musical motion picture released by Crown International Pictures. The film stars Mae West. Other actors in the cast included Timothy Dalton, Dom DeLuise, Tony Curtis, Ringo Starr, Keith Moon, George Hamilton, Alice Cooper and Walter Pidgeon.
Document 4: Dean Martin: Dean Martin (born Dino Paul Crocetti; June 7, 1917 – December 25, 1995) was an American singer, actor, comedian, and film producer. One of the most popular and enduring American entertainers of the mid-20th century, Martin was nicknamed the "King of Cool" for his seemingly effortless charisma and self-assurance.
Document 5: Frank Sinatra: Francis Albert Sinatra ( ; ] ; December 12, 1915 – May 14, 1998) was an American singer, actor, and producer who was one of the most popular and influential musical artists of the 20th century. He is one of the best-selling music artists of all time, having sold more than 150 million records worldwide. Born in Hoboken, New Jersey, to Italian immigrants, Sinatra began his musical career in the swing era with bandleaders Harry James and Tommy Dorsey. Sinatra found success as a solo artist after he signed with Columbia Records in 1943, becoming the idol of the "bobby soxers". He released his debut album, "The Voice of Frank Sinatra", in 1946. Sinatra's professional career had stalled by the early 1950s, and he turned to Las Vegas, where he became one of its best known performers as part of the Rat Pack. His career was reborn in 1953 with the success of "From Here to Eternity", with his performance subsequently winning an Academy Award and Golden Globe Award for Best Supporting Actor. Sinatra released several critically lauded albums, including "In the Wee Small Hours" (1955), "Songs for Swingin' Lovers!" (1956), "Come Fly with Me" (1958), "Only the Lonely" (1958) and "Nice 'n' Easy" (1960).
Document 6: The Wrecking Crew (2008 film): The Wrecking Crew is a 2008 American documentary film directed by Denny Tedesco. It covers the story of the Los Angeles-based group of session musicians known as the Wrecking Crew, famed for having played on numerous hit recordings throughout the 1960s. The film premiered at the 2008 South by Southwest Film Festival.
Document 7: Elvis Presley: Elvis Aaron Presley (January 8, 1935 – August 16, 1977) was an American singer, dancer and actor. Regarded as one of the most significant cultural icons of the 20th century, he is often referred to as the "King of Rock and Roll" or simply "the King".
Document 8: The Menacers: The Menacers, first published in 1968, was the eleventh novel in the Matt Helm spy series by Donald Hamilton and the first published since the launch of the "Matt Helm" film series starring Dean Martin.
Document 9: Larry Knechtel: Lawrence William "Larry" Knechtel (August 4, 1940 – August 20, 2009) was an American keyboard player and bassist, best known as a member of the Wrecking Crew, a collection of Los Angeles-based session musicians who worked with such renowned artists as Simon & Garfunkel, Duane Eddy, the Beach Boys, the Mamas & the Papas, the Monkees, the Partridge Family, the Doors, the Grass Roots, Jerry Garcia, and Elvis Presley, and as a member of the 1970s band Bread.
Document 10: The Dean Martin Celebrity Roast: The Dean Martin Celebrity Roast is an NBC television special show hosted by entertainer Dean Martin from 1974 to 1984. For a series of 54 specials and shows, Martin would periodically "roast" a celebrity. These roasts were patterned after the roasts held at the New York Friars' Club. The format would have the celebrity guest seated on a dais, and one by one the guest of honor was affectionately chided or insulted about his career by his fellow celebrity friends.
Document 11: The Ambushers (film): The Ambushers is a 1967 spy comedy film filmed in Acapulco starring Dean Martin, Senta Berger and Janice Rule. It is loosely based upon the novel of the same name by Donald Hamilton as well as "The Menacers" that featured UFOs and a Mexican setting. When a government-built flying saucer is hijacked mid-flight by Jose Ortega, the exiled ruler for an outlaw nation, secret agent Matt Helm and the ship's former pilot Sheila Sommers are sent to recover it.
Document 12: Martin and Lewis: Martin and Lewis were an American comedy duo, comprising singer Dean Martin and comedian Jerry Lewis. They met in 1945 and debuted at Atlantic City's 500 Club on July 25, 1946; the team lasted ten years to the day. Dean Martin is the stage name of Dino Paul Crocetti, born June 7, 1917, in Steubenville, Ohio, while Jerry Lewis is the stage name of Joseph Levitch, born March 16, 1926, in Newark, New Jersey. Martin died on December 25, 1995 and then Lewis died on August 20, 2017.
Document 13: Jimmy Durante: James Francis Durante (February 10, 1893 – January 29, 1980) was an American singer, pianist, comedian, and actor. His distinctive clipped gravelly speech, New York accent, comic language-butchery, jazz-influenced songs, and prominent nose helped make him one of America's most familiar and popular personalities of the 1920s through the 1970s. He often referred to his nose as "the Schnozzola" (from the German "Schnauze" [nose]), and the word became his nickname.
Document 14: The Wrecking Crew (1968 film): The Wrecking Crew, released in December, 1968, and starring Dean Martin, Elke Sommer, Nancy Kwan, Tina Louise, and Sharon Tate, is the fourth and final film in a series of American comedy-spy-fi theatrical releases featuring Martin as secret agent Matt Helm.
Document 15: Dino, Desi &amp; Billy: Dino, Desi & Billy were an American singing group that existed between 1964 and 1969. The group featured Dean "Dino" Martin (Dean Paul Martin, the son of traditional pop singer Dean Martin), Desi Arnaz, Jr. (Desiderio Arnaz IV, the son of television stars Desi Arnaz and Lucille Ball), and their friend Billy Hinsche. A reconstituted version of the group performed between 1998 and 2010.
ground_truth: King of Cool