This Halloween wallpaper contains
beech, beech tree, live oak, california white oak, valley oak, valley white oak, roble, and quercus lobata.
There might also be
mahogany, mahogany tree, olive, european olive tree, olea europaea, birch, and birch tree.
The Ghostbusters are confronted by Crowley and his group, who want their help in ending Halloween. The guys turn him down, but one of their PKE meters is stolen and used by Crowley to accomplish his goal.