Why was the Doc - an old man - best friends with a teenager? Suspicious.

Rating: 1/10 (15 February 2019)

I find the relationship between the Doc and his teen best friend to be highly unnerving. What were the Doc's REAL motivations for befriending Marty?...
Why is the Doc REALLY ringing Marty at 2 o' clock in the morning? Is he getting a kick out of ringing up a young man at that hour?
Highly unnerving film.