The Discovery Channel has a series running right now called "Planet Earth," and the narrator's voice seems a bit familiar. In fact, it is none other than actress Sigourney Weaver. A classically trained dramatic actress, Sigourney Weaver first got noticed by film audiences as a result of a six second part in Woody Allen's "Annie Hall."

She's probably best known for her portrayal of 'Ripley' in the Alien series, but she's had a slew of other great roles in film and in the theater. And although she has not (as yet) won an Academy Award, She's been nominated a couple of times. She got nominated for Best Actress for "Aliens" (an extreme rarity in the sci-fi genre), and in 1988 she earned the rare distinction of being nominated for both Best Actress and Best Supporting Actress in two different films. The supporting actress nomination was for her part in "Working Girl," can you name the 1988 film for which Sigourney Weaver received her second "Best Actress" Oscar nomination?

Bonus Question: Sigourney Weaver adopted the first name 'Sigourney' after reading "The Great Gatsby" as a teenager. What was the first name she was born with?

Actor Sean Penn was on "The Colbert Report" tonight. Which is irregular considering that the reclusive Mr. Penn isn't exactly a regular on the talk show circuit. But Colbert has had other reclusive guests on his show in the past, including the ever-elusive George Lucas - So, I guess anything is possible for Colbert. If you missed the show tonight, don't worry... Comedy Central re-airs the Colbert Report several times the following day. In any case, here's some fun Sean Pen Trivia in honor of this memorable episode of the Colbert Report.

As most of you are aware, Sean Penn got his start in the 80's. And, for this trivia question, we'll recall a couple of lesser known Sean Penn movies. Mr. Penn is apparently a big fan of Robert DeNiro, and he got a chance to co- star with his idol back in 1989. The stunning thing is that it was a comedy! What was the name of the film?

Bonus Question: Back in the 80's, Sean Penn had a small part in a film directed by his father, Leo Penn. What was the name of the film?

Actress Ally Sheedy was part of the original 'Brat Pack' in the mid eighties, earning that distinction by appearing in such 80's classics as "the Breakfast Club" and "St. Elmo's Fire." She actually considered the term 'Brat Pack' a bit condescending. After all, at the time the Hollywood press was applying term, Sheedy was 23 and had been acting on stage and appearing in commercials since age 15. She had even published her own children's book at age 12 (it probably didn't hurt that her mom was a literary agent.) Ally Sheedy had a bunch of television roles between '81 and '83. Then she made the leap to film with her first motion picture role in a 1983 film that starred Sean Penn. What was the name of the movie?

Bonus Question: Ally Sheedy had a recurring part on a TV series before moving on to film. Her character's name was Kristen, what was the name of the show?

Actor Alfred Molina is back in theaters, with a supporting role in the new Richard Gere film "The Hoax." Molina may not be a household name, but he's a respected stage actor, and he's had his fair share of notable movie roles. He was in last year's "The Da Vinci Code," he was the mayor in "Chocolat," and he played arch villain Dr. Octopus in "Spiderman 2." He's been acting in films since the early 80's, and in fact his very first feature film appearance was in a small but memorable role in a true 80's classic. His character delivers the classic line "No time to argue. Throw me the idol, I throw you the whip." What was the name of this film?

Bonus Question: Not to give away the answer to the first question, but the distinctive opening sequence of the afore mentioned film created enough of a sensation that spoofs have shown up in many subsequent works. The Simpsons did a take off this film sequence in the 90's, and so did a 1989 film starring another famous "Al", the prince of parody, "Weird Al" Yankovic. What was the name of Weird Al's film?

In the 1984 film "Splash," actress Daryl Hannah plays a mermaid who rescues a young boy named Allen from drowning. After another encounter with the grown up Allen years later, she decides to emerge from the ocean, assume human form, and seek him out. He's all grown up at this point, and living in New York City (and played by Tom Hanks). A few clever plot devices are thrown in to explain how the mermaid's tail becomes a pair of legs, and how she learns English. Additionally, once on land, Hannah's mermaid character decides to adopt a name from a street sign. What was the name of Daryl Hannah's mermaid character in "Splash?"

Bonus Question: A few years earlier, Daryl Hannah played a renegade replicant on the run from the Blade Runner. What was her character's name in that film?