[TOMT][MOVIE][90’s-2000’s] A movie about a somewhat benevolent alien in a military research laboratory

I’ve seen this movie once a long time ago. Can’t exactly remember when, but I’m guessing somewhere between the late 90’s and 2010.

It’s a sci-fi movie. I think we follow a group of soldiers that are sent to a research laboratory because something has gone wrong. When they get there they find out that an alien has broken loose and they’re tasked with finding and killing it.

However, we find out that the alien isn’t exactly malicious. It’s just curious. What I remember most is that at some point one of the soldiers is starting to feel ill. I think at one point the alien cornered him and touched his stomach and everybody thinks that’s what’s making him ill, but it turns out he has appendicitis and the alien detected this.

I think in the end the soldiers realize that the alien is somewhat benevolent and they don’t want to kill it, but the military decides to nuke the entire lab anyway.

I’m really hoping I’m not combining multiple movies here, but at least I’m 100% sure about the part with the guy and the appendicitis.

[TOMT][MOVIE][90’s-2000’s] A movie about a somewhat benevolent alien in a military research laboratory