The Biker Babies have faced a lot on the roads of Zoomville. Tough terrain, tight deadlines, and the kind of obstacles that require the whole crew firing on all cylinders just to get through. But the adventures that really test them — the ones that end up in the Zoomville legends — tend to involve a specific kind of trouble. The kind that arrives with a plan.

Meet the ones causing it.

Grumble Gnome

Grumble Gnome looks like someone's eccentric neighbour — shabby coat, muttering constantly, always in the middle of doing something with garden equipment that no garden should need. Don't be fooled by the presentation. Grumble Gnome is meticulous. He plans his disruptions in advance, sets them up across multiple locations, and has an extraordinary talent for turning the Biker Babies' strengths into the source of the problem. He knows how the crew thinks, and he exploits it.

His traps are rarely violent and almost always infuriating — things slow down, routes close off, the straightforward path suddenly has six extra steps. He wants to frustrate, delay, and disrupt. The crew can beat him, and they do, but he makes them earn it every time.

His actual motivation is magnificently petty. He believes he discovered a particular Zoomville trail first, approximately twelve years ago, and that the Biker Babies' use of it is a personal affront. Whether this is true is a matter of ongoing dispute. Either way, he has not let it go.

Professor Pothole

Where Grumble Gnome is grudging, Professor Pothole is enthusiastic — which is worse. The Professor is a civil engineer with strong opinions about terrain, and his strong opinions tend to express themselves as holes. Big ones. Usually somewhere the Biker Babies were planning to ride through at speed.

His mobile lab is the tell. If it has been parked anywhere near a stretch of trail, something is about to be excavated, reshaped, or — in his own words — improved. The Professor does not consider what he does to be disruption. He considers it engineering. The Biker Babies, arriving at a trail that has quietly become a trench, politely disagree.

His thing is grand projects. Small disruptions do not interest him — he wants to reshape a whole section of Zoomville until the route is something new. Which means when Professor Pothole shows up, the obstacle is rarely something the crew can route around. They have to go through it, over it, or, with enough of Hiro's improvisation, use it for something the Professor did not plan.

Together, they keep Zoomville interesting. The Biker Babies wouldn't have half the adventures they do without the obstacles — and obstacles, it turns out, are how you find out exactly what the crew is made of.

They're made of a lot. The villains keep proving it.