What is beyond the Cosmic Microwave Background?

It completely amazes me how big and complex our universe is. Just when we think we solved something or found an answer to our question often something new comes along that might have not even been expected to be discovered or exist or we never even thought of its possible existence. We know so much about our universe, but that is probably just a insignificant fraction of general information the Universe really holds. Well, one day I heard on TV on The History Channel about the multi-universe theory and that there could be so far a theorized 4 types of multi-universes. I also heard that maybe given enough time light from other universes could come into our universe from beyond the Cosmic Microwave Background or CMB. That got me really thinking and I got several ideas. One idea is that you can reach other universes (if there is other universes) by traveling somehow beyond the CMB, but you might have to travel potentially billions of light years to cross this "plane" or line to officially enter the edge of another universe. Also if you could constantly communicate with other humans who are still within the CMB and that this "plane" is actually very close (like up to a few light years from beyond the CMB) to the CMB outside of its limits that once you cross the "plane" you instantly loose communication with the other people if the signals from the communication device can go through the CMB. Another idea I have is that once you cross the "plane" you might experience things never thought possible since you come from an entirely different universe and your body's physics are possibly different from this new universe's physics. Also another reason for this potential unique experience is that you are a new unaccounted amount of mass that was never originally created with that universe from that universe's birth and it has to account for you or somehow get rid of you or deal with you (a.k.a. this new mass). Also if or if not there is something beyond the CMB is our Universe's physics still work out there? I am asking since it seems the CMB is the very limit of our universe and would physics work out beyond the CMB's limits? For example if for whatever reason you go outside the ship or some kind of transportation vehicle with no suit, clothes, or anything on would you actually fell any temperature beyond the CMB's limits? Another question I have is it possible for communication with our Universe once you cross the "plane" and you enter another universe? Also how would the new universe you enter react to your new presence? Also if this new universe in fact does have a completely different set of physics would it immediately react to your different law of physics or would you have to touch matter from that universe for some sort of reaction? Also how would 2 different objects with mass and each with a different set of physics react once they both physically touch each other? Thanks in advance for the answers and please have some links to articles to prove your answer!!