1. Early Life in Scotland: Born on Sep 19, 1933, in Glasgow, Scotland, McCallum's Scottish roots influenced his life and career.

2. Musical Talent: Before acting, McCallum excelled in music, mastering oboe and saxophone, releasing the 1966 hit 'Communication.

3. The Man from U.N.C.L.E.: Portraying Illya Kuryakin in 'The Man from U.N.C.L.E.' made McCallum an international sensation, marking a career pinnacle.

4. Bond Connection: McCallum's link to James Bond: He played Ashley-Pitt, the 'Tunnel King,' in the 1967 film 'The Great Escape,' cementing his Hollywood standing.

5. Family of Actors: McCallum legacy lives on. Son Peter followed his acting path.

6. Voice Acting: McCallum lent his voice to Alfred Pennyworth in 'Batman: The Animated Series,' adding depth to his talents.

7. Long-Lasting Marital Bliss: McCallum's enduring Hollywood marriage to Katherine Carpenter since 1967 is a testament to his character.

8. NCIS Revival: McCallum's iconic return as Dr. Ducky Mallard brings joy to a new generation of viewers.