Question

add or remove commas, if necessary, until the sentence has correct punctuation. spider - man keeps planning to visit aliens in outer space.

Explanation:

The sentence "Spider - Man keeps planning to visit aliens in outer space." is a simple sentence with a single independent clause. There are no elements in this sentence that require commas for separation (such as non - essential clauses, lists, or introductory phrases that need to be set off). So, the sentence already has correct punctuation, and no commas need to be added or removed.

Answer:

Spider - Man keeps planning to visit aliens in outer space.