The Spaak (スパー, Spar in Japan) is a common enemy in the Subspace Emissary in Super Smash Bros. Brawl as a part of the Subspace Army where it is depicted as a cloud with facial features, a battery on its back, and eight Tesla Coils. A Spaak starts off as a white cloud, which attacks by shooting slow electric spheres with low knockback. After taking a certain amount of damage, it turns into a black storm cloud, which shoots out fast lightning beams with high knockback. Both attacks can be reflected or absorbed by Ness and Lucas' PSI-Magnet. Its battery is its weak spot, taking double damage when attacked. Its normal mode is shown on the trophy, regardless of which form was caught.
Its name is a corruption of the word "spark", which relates to its electrical properties.
A Subspace Army member who is mostly cloud but also reveals mechanical parts, like electrodes and batteries. In most cases, a Spaak is white and fires lightning, but it turns into a dark cloud after taking damage and chases you with fast lightning strikes. Its weak point is the battery on its back--attacking that should make it pretty easy to take down.