Edge Attack

An Edge Attack is an attack in the Super Smash Bros. series, which is performed by pressing the attack button while hanging off an edge. All characters, including Samus and Zero Suit Samus, use various Edge Attacks. When performed, Samus or Zero Suit Samus will climb back onto the stage, while attacking any close opponents. This is primarily used in order to pre-empt any attacks by opponents that could KO Samus or Zero Suit Samus.

In Super Smash Bros., Melee and Brawl, Samus and Zero Suit Samus's Edge Attacks change if their damage percentage is over 100%. They will perform a different attack which is often slower, but does slightly increased damage to opponents. In Super Smash Bros. for Nintendo 3DS and Wii U, the Edge Attacks do not change regardless of damage percentage for all characters.

Super Smash Bros.
Samus does a kick with her right leg. If her damage is over 100%, she slowly picks herself up, leans on her Arm Cannon and punches with her left hand. Both attacks deal 6% damage.

Super Smash Bros. Melee and Brawl
Samus climbs back onto the stage with a kick dealing 10% damage. If her damage is over 100%, she will climb onto the stage and punch with her Arm Cannon, but it still only deals 10% damage. The attacks deal 10% in Melee; in Brawl the kick deals 8% from the right leg and 6% from the left, and 10% with the Arm Cannon thrust attack.

Zero Suit Samus in Brawl will climb up and perform a low spinning kick forward dealing 8% damage. If hers is over 100%, she will get up slower and punch, dealing 10%.

Super Smash Bros. for Nintendo 3DS and Wii U
In this game, Samus and Zero Suit Samus share a similar kicking Edge Attack. When climbing, Samus will sweep with her legs. Zero Suit Samus performs a low-angled, one-legged dropkick while climbing up. Both attacks deal 7% damage.

Super Smash Bros. for Nintendo 3DS and Wii U Prima Official Game Guide

 * Samus:"Samus returns to the stage with a long-range trip attack."
 * Zero Suit Samus:"Zero Suit Samus swiftly returns to the stage with a long-range sweep kick that sends opponents horizontally away."