Which is correct?
1) The "The Lord of the Rings" series is popular.
2) "The Lord of the Rings" series is popular.
Which is correct?
1) The "The Lord of the Rings" series is popular.
2) "The Lord of the Rings" series is popular.
"The Lord of the Rings" series is popular.
When beginning "The" is formal part of title or proper name, it should be treated as normal part of sentence, giving just enough clarification about themselves, no additional articles needed (or allowed).
Additionally, you should always capitalize starting "The" of the title (not a case with non-title proper names, like geographic ones).
And, in any case, you should not delete it, as it is internal part of the title.