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Billy Mumy, once the red-haired child star from Lost in Space, thrilled fans this week by sharing a rare and heartwarming reunion photo on social media. Now 71, Billy Mumy has maintained a relatively low profile in recent years, but this nostalgic throwback instantly ignited excitement among longtime viewers of the 1960s sci-fi hit. Billy Mumy now is as cherished as ever, reminding fans not only of his iconic role as Will Robinson but of the lasting connections forged during TV’s golden age. Billy Mumy Still Holds A Special Place In Classic TV History View this post on Instagram A post shared by BillMumy (@officialbillmumy) Despite his youthful fame, Billy Mumy continued to work in entertainment across music, voice work, and writing. But his Lost in Space role remains his most enduring. Fans of retro TV recognize him instantly—his character was central to the show’s mix of science fiction and family adventure. The reunion photo’s warm reception online echoes sentiments often seen in retrospectives like "Then & Now: The Cast of Lost in Space." Mumy’s recent post not only brought joy to fans, but also added a heartfelt reminder that vintage shows still hold deep meaning for their stars—and for the generations of viewers who watched them grow up on screen. Fans Celebrate A Timeless Bond Through Reunion LOST IN SPACE, in front, from left: Mark Goddard, June Lockhart, Billy Mumy, Angela Cartwright, Jonathan Harris, Marta Kristen; in back: Guy Williams, 1965-1968. ph: TM and Copyright ©20th Century Fox Film Corp. All rights reserved. /TV Guide / Courtesy Everett Collection Billy Mumy now serves as a bridge between past and present in entertainment. His reunion post isn’t just a photo—it’s a living testament to a time when families gathered around the TV, drawn into adventures far beyond Earth. In moments like these, Lost in Space becomes more than just a show—it becomes a shared memory. Billy Mumy became an iconic child star thanks to his unforgettable role as Will Robinson in Lost in Space / Image via Wikimedia Commons As highlighted in stories such as "TV Stars of the ‘60s: Where Are They Now?" and "Why Lost in Space Still Resonates Today", Mumy’s continued engagement proves how nostalgic content still connects deeply. His update adds another joyful chapter to a story that began over 50 years ago.