The situation is pretty simple.You pick the two most interesting twins on earth and put them in differents world to see what happens.
Unfortunately it seems that they weren't gonna act like many before them.
"Hey Sis!That Shark guy is fighting with the good guys!"
"Oh!It's Little Kisame!Let's help him and kill them all!"
Maybe sending them in those worlds wasn't a good idea.....Nah!!It's gonna be funny!