Yes, it is a plural noun. It can refer to classic books, classic movies, or to the literature of Greek and Roman times.
The word 'do' is not a pronoun; the word 'do' is an auxiliary verb, and a noun, for example:Verb: We do have the classics on DVD.Noun: Spring is the time for a new hair do.
Popular Classics was created in 2002.
Neuseen Classics was created in 2004.
Classics Collection was created in 1990.
Classics Illustrated ended in 1971.
PS Classics was created in 2000.
Radio Classics was created in 2002.
Live Classics was created in 1992.
Orion Classics was created in 1983.
Orion Classics ended in 1999.
Kids' Classics was created in 1991.
Remix Classics was created in 1991.