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?
Sentence (from "Dean Martin"): 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.
Relevant evidence: Yes