"Should we go to Sam's planet to help him? I already know many people from different planets came to this planet so that they can get to the core of that planet."
" No, I don't think we needed to go there as Sam is alone to handle those people. First of all, you should know that he already reached the planetary grade before going back to his planet so he is easily able to use the power of domain even in restriction force.
So we should trust Sam that he would be able to handle everything. But still, I am very worried about him, and like you said I also wanted to go to his planet to help him. But that will take us too much time and who can give us the guarantee that during that time no sudden serious situation will appear on our planet?