This category is for any person, place or thing that is not shown in the Back to the Future franchise, but has appeared in crossovers involving a BTTF character or more.
“Dr. Douglas "Doogie" Howser is the main character of the live action series Doogie Howser, M.D...Doogie Howser
“Mother Nature is the personification of nature itself, and has the task of nurturing those on...Mother Nature
“Mr. Friedman was a banker whom Doc Brown arranged to sign a contract with in order to keep the...Mr. Friedman
“The Mississippi River is one of the largest rivers in North America. Since modern developments...Mississippi River
“Anytown is a town in the United States, though its exact location is unknown. Anytown was...Anytown