Rachel Weisz is jumping into "The Fountain."

The actress is on board to star opposite Hugh Jackman in the sci-fi pic being directed by Darren Aronofsky, who also is producing via his Protozoa Pictures shingle. Also producing are Protozoa partner Eric Watson. Regency Enterprises and Warner Bros. Pictures are co-financing.

Much of the story is being kept under wraps, but it is known that it follows one man's journey in the present as well as 500 years into the past and future, while dealing with the themes of love, death and immortality. Aronofsky wrote the screenplay with Ari Handel, who also is Protozoa's president.

Jackman coming on board in February resuscitated the project, which languished when Brad Pitt left in August 2002 after many delays.

Weisz steps into the role that Cate Blanchett was originally going to play when Pitt was still involved.

A November start date is planned.

The CAA-repped actress will be seen in the upcoming Warners film "Constantine." Her credits include "The Mummy" and "The Mummy Returns" as well as "About a Boy" and "The Shape of Things."