Star Trek, with Sheldon even citing Starfleet regulations during an argument in one episode and the main characters dressing up as Data, Worf, Captain Picard and a Borg drone, respectively, in another. Also the series features Wil Wheaton in a recurring role as a fictionalized version of himself plus guest appearances from Brent Spiner, LeVar Burton and William Shatner, and a voice-only cameo from Leonard Nimoy, who voices a Mr. Spock action figure talking to Sheldon in his dreams. There was also an appearance of a Gorn in one episode. The Gorn captain's fight to the death with Captain Kirk in the original series episode, "Arena", was the subject of an episode of the television series MythBusters, in which the viability of Kirk's improvised bamboo cannon was put to the test. Parodies and tributes Star Trek has been the subject of a large number of parodies and tributes. Prominent among film parodies is Galaxy Quest, as it parodied the original Star Trek series, elements of Star Trek: The Next Generation, and the whole Trekkie phenomenon. On television, the animated series Futurama makes frequent references to Star Trek and parodies some of its better known plot elements on a regular basis, including the character Zapp Brannigan who is based on a combination of Captain Kirk and William Shatner, and cast members of the original series have taken part in one episode. Prominent examples in other television series include multiple episodes of The Simpsons and Family Guy. The children's series The Backyardigans has an episode titled "Garbage Trek" that is an homage to the original series. Joss Whedon has cited Star Trek as being the father of his cult series Firefly and its film Serenity (2005). The direct-to-video series VeggieTales features two Star Trek parodies, including "The Gourds Must Be Crazy" (from Are You My Neighbor?) and Veggies in Space: The Fennel Frontier which serves as a sequel to the other. The character Scooter is based on Montgomery Scott. There are many other parodies in comic strips, music and computer games, such as Eminem's song "We Made You". In the music video, Eminem was dressed as Mr. Spock and Dr. Dre as Captain Kirk. In 1995, MTV's animated series Beavis and Butt-Head parodied the series with Beavis as Captain Picard and Butt-Head as Commander Riker. An entire Finnish parody series Star Wreck was produced starting in 1992, culminating with Star Wreck: In