Denise Huxtable Finds Life On Mars Adding to the increasingly unusual cast list of the revamped US version of Life On Mars , Lisa Bonet — star of The Cosby Show , Angel Heart and... well, not that much else — has signed on to star as the 2008 girlfriend of Jason O'Mara's coma-time-traveling cop, giving him something to come back to should he choose to leave co-stars Harvey Keitel and Gretchen Mol in the early '70s, according to Entertainment Weekly 's Michael Ausiello. [Entertainment Weekly ]