Invincibility frame

From SmashWiki, the Super Smash Bros. wiki

Invincibility frames are the period of time (measured in frames) during which a character cannot be damaged. Depending on which kind of invincibility the character has, the attack may "hit" or "miss".

[edit] Invincibility attacks

Ike's Counter Only 1 frame.
Marth's Counter Only 1 frame.
Roy's Counter Only 1 frame.
Fox's Fox Illusion Only 1 frame.
Falco's Falco Phantasm Only 1 frame.
Wolf's Reflector, First 6 frames.
Marth's Dolphin Slash First 5 frames (5th frame is also hit frame, Brawl only).
Mr. Game & Watch's Fire From frame 9 until frame 13.
Bowser's Whirling Fortress Grounded version, first 5 frames.
Donkey Kong's Spinning Kong Air version, first frames (Brawl only?)
Sonic's Up smash before the hitbox come and Spring when Sonic starts to jump.
Pikachu's Thunder, Beginning frames when Thunder strikes Pikachu.
Kirby's Inhale
Zelda's Farore's Wind right before Zelda teleports.
Sheik's Vanish right before Sheik teleports.
Lucario's Double Team, the time when Lucario is able to strike back and when he strikes back (prevents trap final smashes).
Jigglypuff's Rest, Approximately 20 frames after it's released, while its eyes are closing. (During the attack hitbox)
All Final Smashes grants invincibility at least in the start of it.

[edit] Blocking Invincibility

A character with blocking invincibility will be hit by attacks (so the attacker takes hitlag), but will not take damage or hitstun. For example, characters using a Starman have blocking invincibility, as well as characters about to throw someone (this invincibility lasts 8 frames). Other examples of blocking invincibility include:

The 2 seconds (120 frames) after dismounting a revival platform.
The secondary Ice climber for a second when Belay is used.
The start of Lucas' and Ness' PK Thunder 2.
The entire duration of Squirtle's Withdraw

[edit] Dodging Invincibility

A character with dodging invincibility will not be hit by attacks. For example, a projectile will travel right through him or her. This kind of invincibility is often attributed to dodges, techs, edge-grabbing, get-up attacks and animations, and certain body parts during certain moves. Since the invincible character is not hit, a long-lasting attack (or very short invincibility time) may still hit the character once the invincibility ends.

[edit] Negative Aspects

Overall, invincibility is generally a good thing. However, one negative aspect is that on the Brinstar and Norfair stages, you will fall straight through the lava, rather than sustaining damage and bouncing back up.