Back to the Future: The Game

This trophy is story related and unmissable.

This will unlock after using your dad and Jennifer's help to get you out of your cell. Start by using the intercom and asking the guard if you can see your stuff. Now look out the window above the poster to see Jennifer in the cell next to yours. Use the Squawk Box to contact your father and ask him if you can talk to Jennifer. Exit this conversation and talk to your dad again. Tell him you were trying to look over the guard's shoulder, but he was too tall. Your dad will review the footage and tell you the code to the locker with your guitar in it.

Now that you have your trusty guitar, equip it and interact with the Squawk Box to break Jennifer free of the spell. She will open your door and free you, and your trophy will unlock.

Refer to the Trophy Walkthrough under "To The Expo!" , for more.