The entrance collapses mid-battle with Locke and Lode, leaving Trixie and Eli stuck in an old, abandoned cavern with only one way out. Now they'll have to cross the entire thing without the help of their mechas.
Thinking they're alone, Eli and Trixie are shocked when Locke and Lode ambush them as they make their way to the distant cavern exit. With only a few slugs between them, our heroes will have to use everything they can to escape.
Having just escaped from the better equipped Locke and Lode, Eli and Trixie are on the run. Unfortunately, they're running straight toward a spike-filled gorge! A last gasp shot saves them from falling to their doom.
Pronto discovers a system of underground tunnels in the cavern Eli and Trixie are trapped in.
Eli and Trixie struggle to work their way through the old transport tunnels, battling rockslides and impassible pathways that lead to deadly falls. But a new slug friend, Uni, could be the key to finding a safe path.
Attacked by a giant tentacle monster in the tunnels Eli and Trixie try to use their new slug, only to discover Uni has some of the most amazing battle moves they've ever seen! But they quickly learn it comes with consequences.
With their own slugs now unable to transform, Eli and Trixie struggle to figure out the new slug's powers; they seem to change at random, which is making it tough to battle off the monster stalking them through abandoned tunnels.
The team finally finds an exit to escape from the abandoned tunnels, only to find it blocked once again by the monster that's been stalking them and trying to snatch their new slug Uni; help arrives from an unusual source.
The unruly little neo-protoform slugs wander off into the woods all alone, so, worried they're lost and helpless, Trixie sets out to find them, until she ends up needing her own rescue party.
Desperate to get Burpy's powers back Eli has been ceaselessly training with the little slug, firing him over and over with the hope he'll finally transform. Now exhausted and disheartened.
Everyone's been training hard to try and get the slugs transformation abilities back again. Trixie decides they all need a break and it's a good time for them to have a little treat - undercorn fritters for everyone!
Trixie tries to motivate the slugs to train more with a fun sports-style event. But the unruly neo-protoforms are having a hard time focusing, especially Spinner who can't seem to find his motivation. Until Gale steps in to help.
Chiller wants to play with his ice powers more than he wants to train. Trixie realizes the more the slugs use their protoform powers the quicker they can level back up, so she sets a task for him – create the perfect snowball.
On the run from the better-equipped Locke and Lode, Eli and Trixie are desperate to train up more of their slugs and get back their powers, but they'll need to get creative with the wild slugs nearby.
On the run again, Eli and Trixie find themselves trapped between Locke and Lode, stuck in the middle of a deep spike-filled gorge; the villainous twins are demanding the gang hand over their new slug, Uni.
Eli and Trixie can't believe their eyes when a foe from their past ambushes them in the middle of the night; he's been helping Locke and Lode all this time, and now he's come for the ultimate prize.
Their new slug friend Uni has been kidnapped! Vowing to never leave a teammate behind, the gang hatches a daring rescue plan to retrieve him. First step? Capture the deadly hoverblade.
The Shane Gang attempts a stealthy nighttime ambush to rescue Uni from the clutches of their enemies. When an over-excited slug gives their position away they're forced to find an unusual escape path.
The cavern exit, where their mechas and the rest of their slugs are waiting, is now in sight. Eli, Trixie and their slugs will have to be extra quiet and careful to avoid detection and make it out alive.
With their enemies trapped, Eli and Trixie are home free with their mechas and the rest of their slugs waiting for them at the cavern entrance. But the battle's not over yet! With only a few of their slugs powered back up.