 Other regular characters include heads of development Charles and Freddie Thomas, Master Mechanic Michael Warren, Martian archeologists Barney Carroll and James Baler, Baler's sister Christine, Terran Electric Company lawyer Mark Kingman, Terran Electric physicist Wesley Farrell, and neurosurgeon-turned-evil-genius Allison "Hellion" Murdoch.A frequent background character is Joe, operator of the "best Bar in Twenty-Seven Million Miles, Minimum!