Help my whole scene is uneditable and unselectable

If I select the object in the outliner and go into edit mode I can edit the mesh. However, I can’t edit the whole object or select it in the viewport. No object modifications work. This is the same for all objects.

I’m really confused, as all other scenes work just fine. Help? @_@

This is a Blender3D screenshot, not a Unity3D screenshot. :slight_smile: