Super Giant-Form (超巨身術 Chō Kyoshin Jutsu, lit. "Super Giant Skill") is the maximum sized Great Namekian form, a power used by the Demon Clan.[1]
Overview
The Super Giant-Form is considerably larger than the previous Great Namekian transformation. When Piccolo used this against Goku, the World Tournament announcer said he was as big as a mountain (in the manga) or volcano (in the anime). However, Goku takes advantage of Piccolo's gargantuan size in order to retrieve Kami, causing him to realize the flaws of the form and thus return to his base form.
Dark Giant
Main article: Dark Evolution
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Dark Super Giant Slug merged to the Earth
In the Dark Empire Saga of Dragon Ball Heroes, after merging with the Six-Star Dark Dragon Ball, Slug is forced to undergo a dark evolution due to Towa. Lord Slug takes on the Dark Giant version of the Super Giant form, gaining a dark energy from his head and back, and merging with the Earth itself.