Yes. Alien Hypno's effect states "take control of it while this card is on the field". If Alien Hypno is removed from the field, you no longer control the opponent's monster and it is returned to them.
You do.
No, there is nothing that can do that.
no it is not...
defeat all level 1 opponents 5 times each
monster reborn
Assuming the defending monster is also in attack position, both monsters will be destroyed.
magic trap and monster
Five-Headed Dragon.
Unless the monster specifically says otherwise, it takes two tributes for a monster of Lv7+
yes its name is dark blade
Your monster is destroyed if the monster you attack is in attack position, and you lose life points.
deafeat 3 opponents 5 times in world champion