Kraid is a boss appearing in the Metriod series. Kraid is a big, green monster with 3 eyes, razor sharp teeth, and spikes in it's belly. Knowing that, Kraid is a formidible foe and is yet to be playable.
In SSBM
Kraid can be seen in the Brinstar Depths stage. It appears in the background rising from the lava. It bites around a few times then slashing the stage, which causes it to tilt. Kraid can't hurt you and you can't hurt Kraid. He also appears as a trophy.