I remember as a kid seeing a show that stuck with me for some reason, though the memory is vague enough that it might have simply been a dream, or an amalgamation of existing shows. The elements I remember (in no particular order) were:
1) Some kids on the run from police, one transforms into a car (or maybe a motorcycle), goes over a jump on a narrow road, evading police. The setting was at night, outside of some kind of warehouse/club (think the beginning of the music video to Smooth Criminal). Also reminded me of the alleyway scene in Equilibrium. Car/cycle was sporty, either red or black.
2) Two of the kids (brother/sister?) find a witches lair, peering in from above while the witch cannot see them. Spider motifs everywhere within the lair, which amounts to a medium dirt cave dug vertically. The witch is unaware of their presence, but danger is still present (suspenseful music).
I want to identify the kids in both situations as the same, but am unsure whether this actually exists or not. Does anybody know what this (or either component) might be from?