"The Ghost of the Joker"
After the Joker is apparently killed in an explosion following his escape, he returns as a ghost. This poses a problem for the Caped Crusaders, when new crimes are pulled they can easily catch the henchmen, but the Joker always seems to vanish.
"The Charmed Life of Batman"
When an alchemist grants Batman any wish, Batman wishes for the ability to avoid harm.
"The Eight Wonders of Space"
After a mission in space, Batman and Robin return to Earth as aliens. It would seem that somehow they passed into and out of another dimension. They think it will wear off, but don't know how long it will take.