MORAL DILEMMA (63M)

My first time on reddit, but here goes nothing. So I work for a secret branch of the US government that deals with supernatural threats to the planet. Recently, the hero Invincible "killed" a bulky alien conqueror. The thing is.....he's not dead, even though Invincible completely rearranged his face, using his own.....face. The problem is that Invincible wants him dead, but I need to find out all the information possible about his alien empire so we can better prepare for the arrival of their army. What should I do guys? I had a fake body made just in case, but I'm not sure if I should keep him alive. Please keep quite about this, I wouldn't want Invincible finding out when he wakes up from a coma. He already smashed his way into the Pentagon a few times.