Image Gallery #1:
Scan 50% of the creatures & research data.

Image Gallery #2:
Scan 100% of the creatures & research data.

Image Gallery #3:
Beat the game under Hard difficulty.

Image Gallery #4:
Collect 100% of the power-ups.

Three different endings:
Beat the game with under 75% completion for the standard ending. Beat the game with between 75% and 99% completion for the better ending. Beat the game with a 100% completion and you'll get the best ending.

NES Metroid and Metroid Fusion Suit:
You will need a copy of Metroid Fusion for the Game Boy Advance. Beat Fusion, connect your Game Boy Advance with a link cable and you will be able to play the classic NES Metroid on your GameCube. Beat Prime, connect your Game Boy Advance with a link cable and you will be able to play Metroid Prime wearing the Metroid Fusion suit.

Beat Parasite Queen in 3 seconds:
In the room before Parasite Queen (the large door with 2 turrets), leave the turrets and open the door, when you gain controle of Samus, go through the door and off to the right, turn back to normal Samus and oush yourself against the wall, while at the same time, running towards the boss stage, then skip the cutscene. If all goes well, the opening in the shields will be right in front of you. Skip the scan and aim for her mouth and fire RFM (Rapif Fire Missiles) by pressing the A and Y buttons at the same time. If it works, by the time the message about strafing comes up, you'll already beat her!

Thanks to Revolution readers Jay Psychotic, Odie, Leland Taylor, Nick Cal, thebestusernamee, and Willy Wonka!