Copyright Issue?

Wyatt: I have a new story idea.

Me: Great! What is it?

Wyatt: A guy goes up into space and gets frozen or something and he's up there for a long time and when he comes back to Earth everything's changed because it's the future.

Boone: That's just like Buck Rogers. Is you character called Buck Rogers?

Wyatt: No.

Boone: What's he called?

Wyatt: ...Steve.