Charles William Mumy, Jr. ( ; born February 1, 1954) is an American actor, musician, pitchman, instrumentalist, voice-over artist and a figure in the science fiction community. He is known primarily for his roles in movies and television, character-type roles, and who also works in television production. The red-headed Mumy came to prominence in the 1960s as a child actor as Guy Williams's and June Lockhart's youngest child/son, and Jonathan Harris's closest friend, Will Robinson, in the cult 1960s television series, Lost In Space, and as a lonely teenager, Sterling North, in the Disney movie, Rascal. In the 1990s, he had a recurring role as Lennier, in Babylon 5, and he also served as narrator of A&E Network's Emmy Award-winning series, Biography.

Along with his most impressive list of television/film credits, Bill is also a very talented well-known musician, songwriter, recording artist, as well as writer. He plays guitar, bass, keyboards, banjo, mandolin, harmonica, percussion and sings. He has released three solo CDs, 1997's "Dying To Be Heard", 1999's "In The Current", and the 2000 release of his third solo album, "Pandora's Box". All three released on Renaissance Records. In 1978 Bill and his partner, Robert Haimer, officially formed the infamous "quirky-rock duo" Barnes and Barnes. They are known worldwide, and have recorded 9 albums on Rhino and CBS Record labels. They also released a feature length home video titled "Zabagabee" featuring a Collaboration of Barnes and Barnes short films. Their infamous "Fish Heads" song placed #57 in Rolling Stones Top 100 Videos of All Time. In 2000, Ogio Records released the 24 song "Yeah: The Essential Barnes & Barnes" CD. Bill was nominated for an Emmy in 1991/1992 for his original song composition for Adventures in Wonderland for Disney which he wrote 105 songs for 100 episodes. He also scored three episodes of the award winning PBS series "The Universe and I" and contributed songs and themes to "Santa Barbara", "TV Guide Looks At", "Hard to Hold", "Plainclothes", "Archie", "Sunshine", "Bless The Beasts & Children", "The Simpsons", and many other film and television projects. Bill and Miguel Ferrer are currently in a rock and roll band called the Jenerators. Their first CD and cassette titled the "Jenerators" was released in 1994 on Asil Records. Their second CD produced by Frank Wolf titled "Hitting The Silk" was released in November of 1998 on Wildcat Records. They currently perform in the Los Angeles area when possible. If that is not enough, Bill has also worked on various children albums as well. "The Yogi Bear Environmental Album: This Land Is Our Land" a 1993 release on Rhino Records/Hanna Barbera, "The Dinosaur Album" also a 1993 release on Rhino Records, and his current album "Kiss My Boo Boo" which has been released on the Infinite Visions label. In addition to his many other talents, Bill co-created the popular children television series, "Space Cases" (1996) with Peter David which he also co-wrote, produced, composed music for, and guest starred in as well. It was nominated for the 1996 Ace Award for "Outstanding Children's Series." The series has run globally in over sixty countries. Peter and Bill have written the screenplay to the feature film, "Overload" which Bill is also starring in. Bill has written as well as co-created many comic books, stories, and television series. He has written for Marvel Comics, Dark Horse Comics, DC Comics and Pocket Books. The stories he co-wrote include well-known titles as "Spider-Man", "The Hulk", and "Clive Barker's Hellraiser." He co-wrote a Star Trek trilogy "Return of the Worthy", and was a creative consultant and writer to the Lost In Space Innovation monthly comic. He also has written for DC comics, "Aquaman", "The Spectre" and "Star Trek". His current writing projects include the feature film, "Overload" and a fantasy novel co-written with Angela Cartwright, "Realms Of Majik: The Pocket in Reality". His short stories, "The Black '59" and "The Undeadliest Game" appeared in Pocket Books "Shock Rock" Volumes 1 and 2. Both have been printed globally in many languages. He has also written for animation, most recently an episode of the sci fi series, "Roswell Conspiracies". He has also written episodics for NBC's series, "Sunshine", USA network's "Swamp Thing", as well as scripting an unfilmed episode of "Babylon 5". He co-created and wrote the Marvel Comics series' "The Comet Man", "The Dreamwalker" graphic novel, and Dark Horse Comics' "Trypto, The Acid Dog" with Miguel Ferrer. Included in his various multi-talent accomplishments, he is also a prolific voice over actor and can be heard narrating several of the prestigious "A&E: Biographies" as well as many other documentaries and specials. Some of his commercial work in that arena includes McDonalds, Mattel, Bud Ice, Amtrak, Blockbuster, Ford, KFC, Wal Mart, and Nickelodeon - just to name a few. He is presently doing all the television and radio spots for Farmers Insurance. His voice over work in animation includes "Ren and Stimpy", "Batman the Animated Series", "Animaniacs", "Little Wizard Adventures", and "Buzz Lightyear: Star Command".