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?

Context articles: Dean Martin Sings
Hope Hampton
Martin and Lewis
The Menacers
Dean Martin
Scared Stiff (1953 film)
Money from Home
Billy Strange
The Wrecking Crew (1968 film)
The Wrecking Crew (2008 film)

Dean Martin Sings is the first studio album by Italian-American singer Dean Martin, released in 1953.
 It is the first long-play 10-inch album recorded by Martin for Capitol Records during two sessions recorded on the evening of November 20, 1952.
 The first session was recorded between 5 and 8 PM and it produced five songs featuring string arrangements.
 "There's My Lover" was recorded but not released.
 After a ninety-minute break, Martin was joined by a brass arrangement to record the remaining four songs.
 Seven of the eight songs on this album appeared in the Martin & Lewis film, "The Stooge".
 Two years later, the songs from this 10-inch album would be combined with four newly popular songs recorded between 1951 and 1953 to create a full-length 12-inch album.
 The 2005 Collectors' Choice reissue added four bonus songs recorded between 1949 and 1953 and was released with alternative cover artwork.
Hope Hampton (Mae Elizabeth Hampton) (February 19, 1897 - January 23, 1982) was an American silent motion picture actress and producer, who was noted for her seemingly effortless incarnation of siren and flapper types in silent-picture roles during the 1920s.
 She also at one time was an aspiring opera singer.
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.
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.
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.
Scared Stiff is a 1953 American musical comedy film directed by George Marshall and starring Dean Martin and Jerry Lewis.
 One of the 17 films made by the Martin and Lewis team, it was released on April 27, 1953 by Paramount Pictures.
Money From Home is a 1953 film starring Dean Martin and Jerry Lewis.
 The comedy was the first for the Martin and Lewis team to be shot in color and was their only film in 3-D.
 The picture was premiered as a special preview screening across the U.S. on New Year's Eve, 1953.
William Everett "Billy" Strange (September 29, 1930 – February 22, 2012) was an American singer, songwriter, guitarist, and actor.
 He was a session musician with the famed Wrecking Crew, and was inducted into the Musicians Hall of Fame and Museum as a member of The Wrecking Crew in 2007.
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.
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.