This series started as The Indescribable Motormouth, but the indicia changed to Motormouth & Killpower after issue #4.
Motormouth ran for twelve issues with Harley and later her partner Killpower going to various alternative realities from the regular Marvel Universe. Motormouth is a teenage street-rat from London,England with a fierce temper who curses constantly.
When she is seventeen, Harley is discovered by Laarson, an agent of Mys-Tech, the shadowy organisation that featured in all of Marvel UK's 1990s titles. Harley is a candidate for his MOPED (Mind Operated PErsonal Dematerialization) technology. This allows people to jump between alternative realities but will only operate on people with certain strands ofDNA. The unit is disguised as a pair of training shoes, which Harley finds and tries on. At the same time Laarson is being executed by Mys-Tech's Techno-Wizards and agents were sent to find the MOPED units. In order to save her and the units, Laarson's subordinates activate the technology and send her to another universe