Lennier is a character in the fictional universe of the science-fiction television series Babylon 5, played by Bill Mumy.
Kristen also provided voice work for the 2009 animated theatrical short The Bolt Who Screwed Christmas which also included voice work from her Lost in Space co-stars Jonathan Harris, Bill Mumy and Angela Cartwright.
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She appeared in a 1961 episode ("Bang! You're Dead") of Alfred Hitchcock Presents, alongside Billy Mumy, who would later co-star with Kristen in Lost in Space.
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In Batman: The Animated Series, the Terrible Trio are bored, rich men versions of Warren Lawford (voiced by Bill Mumy), Armand Lydecker (voiced by David Jolliffe), and Gunther Hardwick (voiced by Peter Scolari).
The Jenerators are a blues-rock band based in Los Angeles, CA featuring Tom Hebenstreit on vocals, electric guitars and keyboards; Bill Mumy on vocals, acoustic and electric guitars, harmonica, keyboards, and percussion; Gary Stockdale on vocals and bass; Miguel Ferrer on vocals, percussion and drums; David Jolliffe on guitar, percussion and vocals and Chris Ross on drums and percussion.
In the 1980s, Fischer worked with Art and Artie Barnes (actually Bill Mumy, of Lost in Space/Babylon 5 fame, and Robert Haimer), to produce two albums, Pronounced Normal (1981) and Nothing Scary (1984).