May 18 is the 138th day of the year.

Event

Behind the scenes

• 2016, Wednesday: The Back to the Future: Untold Tales and Alternate Timelines trade paperback, which collects the first five issues of IDW's Back to the Future comic, is released.
• 2025, Sunday: The final day of Back to the Future: Destination Hill Valley at Fan Fest Nights at Universal Studios Hollywood.