Dania Ramirez, Zachary Quinto and Shalim Ortiz in Heroes by Chris Haston/NBC Photo Dania Ramirez, Zachary Quinto and Shalim Ortiz in Heroes by Chris Haston/NBC Photo

NBC has pulled the plug on Heroes: Origins, the Heroes spin-off that was slated to run next April. The network declined comment, but sources said the possible strike by the Writers Guild of America - which could happen after the guild's contract expires midnight Thursday - played a role in the decision.

"Looking at everything in context of the strike, we're evaluating all of our production commitments," said one insider. "Scripts haven't been written yet."

Origins was designed to provide fans with six episodes of a fresh Heroes-related show in place of repeats in the spring. If the labor situation changes quickly, the network could revisit the decision to scrap the show. - Reporting by Stephen Battaglio