See Also: 'Leapin' Lizards' Episode Guide

When Marg Helgenberger first learned about the storyline for the episode "Leaping Lizards," she suspected that the writers might have been on some mind-altering drugs.

"Honestly, when I read that script, I thought the producers had really started smoking crack big time, because it was so out there and surreal, and there is shape-shifting stuff," Helgenberger said to Entertainment Tonight, explaining her initial reaction to the plot of the most recent episode of CSI: Crime Scene Investigation. The episode, which revolved around a group of people who believed that aliens were trying to conquer mankind, isn't as far-fetched as Helgenberger originally thought. In fact, it was based on a real case.

The alien storyline is only one episode in what has been an attention-grabbing season for the team. "The whole miniature killer [story] we have been doing off and on throughout the year has been really fascinating for us and, I think, for the audience, too," William Petersen said. And the story isn't over yet: fans can look forward to seeing more about the elusive serial killer in the season finale.

Petersen also spoke about his character's relationship with Sara Sidle (Jorja Fox). The two have kept things private so far, and when asked about where he sees the relationship going, Petersen didn't say much. "My character doesn't want [their relationship] revealed to anyone ever, so I am not going to cheat and tell," he said.

For the full interview, head over to ET Online.

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