Baljeet-2:"Think of the universe and all of the many dimensions as circular. The energy flows between the dimensions like this, clockwise. Say this is your dimension, and this is our dimension. You traveled with the flow of energy, so going clockwise would be easy. Going counterclockwise would take 8,000,000 gigawatts of energy, overloading the local power grid. I have prepared a little song to help illustrate my point."
[…]:"[plays accordion] ♪If you travel through dimensions
Going clockwise makes it easy
Going counter-clockwise would take 8,000,000 gigawatts of energy
Overloading the local power grid♪
I know, it needs a chorus. Anyway, without the 8,000,000 gigawatts, you would have to go clockwise, the long way around. Theoretically, you would get home, but there is no telling how many dimensions you would have to go through."