Parasite Queen

The Parasite Queen is the very first boss in Metroid Prime. It is encountered on Orpheon.

Biography
The Parasite Queen is a genetically enhanced Parasite. It is believed that the Space Pirates had use Phazon on the creature to mutate it. There may also be other Parasite Queens on the frigate as Samus encounters the remains of one in a stasis tank while the other one she sees killed by Space Pirates as she is evacuating the frigate.

The battle
The Parasite Queen is a totally straightforward boss. All Samus has to do is lock on the creature and fire at it. It will use shields to protect itself, though the shields have spaces in them which allow firepower to reach the Parasite Queen. The Power Beam, Charge Beam, and especially Missiles are very effective against the creature.

The Parasite Queen will open its mouth sometimes to roar at Samus. If Samus scans the Parasite Queen with the Scan Visor, she will learn this is its weak spot. She will now target the mouth, causing great damage to the Parasite Queen when she fires at it.

Sometimes the shields will spin rapidly around the creature. Samus can either fire her Power Beam repeatedly to do some damage or charge her Power Beam and then fire it once the shields stop spinning.

Once the Parasite Queen is destroyed, it damages the frigate's reactor core. Due to this incident, Samus has seven minutes to evacuate the frigate.