Even though most industry observers expect CBS to renew "Moonlight" without prompting, fans of the vampire drama are using their blood (and maybe sweat and tears) to save their show.

According to The Hollywood Reporter, "Moonlight" fans are joining forces with the Red Cross and YouChoose.net to organize a nationwide blood drive in support of the series. Already more than 3,000 fans have pledged to donate a pint.

In addition, the trade paper is reporting that the fan actions are expected to prompt Alex O'Loughlin, the show's blood-sucking star, to take a new role as Red Cross spokesman.

While "Moonlight" has routinely lost viewers between "Ghost Whisperer" and "Numb3rs" on Friday nights, CBS gave the freshman drama -- subject of extensive casting and showrunning tumult both before and during the season -- a vote of confidence with a four-episode post-strike order.

"Moonlight" returns to CBS on Friday, April 25.

For more information on the fan campaign -- and because giving blood is always a good thing to do -- check out its site.