Denise Huxtable’s about to inhabit a truly different world.

Former Cosby Show offspring Lisa Bonet is joining the cast of ABC’s adaptation of the time-tripping U.K. cop drama Life on Mars, sources confirm to me exclusively. Bonet will play Jason O’Mara’s present-day girlfriend.

Bonet’s hiring comes on the heels of another high-profile Mars casting: Earlier this week, Gretchen Mol signed on to play O’Mara’s circa ’73 squeeze, setting the stage for one unorthodox love triangle.

Previously announced Mars inhabitants include Harvey Keitel and Michael Imperioli.

addCredit(“Jason O’Mara and Lisa Bonet: Vivian Zink; Jeff Kravitz/”)