Cryscada (debuted in Return of the Elementals).

Hoverblade (debuted in Return of the Elementals).

Flatulo Rex (debuted in Return of the Elementals).

Darkfurnus (debuted in Ghoul From Beyond) - see Burpy & Joo-Joo.

Goon Doc (debuted in Ghoul From Beyond) - see The Goon.

Lariat (seen in The Return of the Eastern Champion).

Fandango (seen in The Emperor Strikes Back).

Crystalyd (seen in Return of the Elementals).

Vinedrill (see in Return of the Elementals).

Speedstinger (seen in Return of the Elementals).Hoverbug (seen in Return of the Elementals).

It has been shown that certain Slugs can not megamorph yet if they're not experienced enough, for example Stunts who has not been slung as much as Eli's favorite slugs was not used to the speed and thrown off, until Slugterra: Eastern Caverns when he megamorphs. Red Hook has created a blaster modification ( Accelerators) that allows blasters to shoot megamorphs without the need of a Mecha to take the shooter to 100 MPH. The power of the megamorphs seem to exceed that of Fusion Shots. Slugs that megamorph stay in their megamorph form even when shot at normal speeds. As a result, Eli's blaster shot out a slug that had already reached sufficient velocity, causing the speeds to stack up and consequently transform Burpy into a megamorph. This happened when Eli Shane shot Burpy while using Mecha upgrades that enabled travel at 100 MPH. The first known megamorph happened to Burpy, Eli's Infurnus, evolving his power and changing his appearance slightly. Megamorphing is when a slug can hit 200mph, and can handle the intense speeds, which not only results in making the slug faster, but also stronger.

Enigmo megamorph