Answer:
The sentence that contains the appositive phrase that is not correctly punctuated is the following one: One hero in the animation field is Mel Blanc the voice behind many cartoon characters.
Step-by-step explanation:
An appositive is a noun or noun phrase that renames another noun right beside it. Nonessential appositive phrases are always separated from the rest of the sentence with commas because the information they provide is not considered relevant to the meaning of the sentence. If the nonessential appositive was dropped, the meaning of the sentence would be left unchanged (see 1).
1) One hero in the animation field is Mel Blanc