There's only one man who can help me.
2 seconds sound clip from the Back to the Future Part II movie soundboard.
You can hear this line at 01:40:34.746 in the Blu-ray version of the movie.
Quote context
[...]
- Wait, wait, kid! Wait a minute. What's this all about?
- He's alive! The doc's alive! He's in the Old West, but he's alive.
- Yeah, but, kid, you all right? Do you need any help?
- There's only one man who can help me.
- What?
- Okay, relax, Doc. It's me. It's me! It's Marty.
- No, it can't be. I just sent you back to the future.
- Yeah. No, I know. You did send me back to the future, but I'm back. I'm back from the future.
[...]