Bill Mumy shared one of his favorite memories of working with his late Lost in Space co-star June Lockhart—and it wasn’t from an episode of the 1960s sci-fi series.
In a post shared to Instagram on Nov. 1, the actor, 71, shared a still from an episode of the wild 1990s animated sitcom Ren and Stimpy. He captioned the photo of two big-headed animated characters with, “Staying in Halloween mode today. Guesting on Ren & Stimpy with June Lockhart was indeed a Showbiz highlight! ‘BLAZING ENTRAILS’ is the episode title. I was Dr. Brainchild, and June was my Mom. A true ‘HOOT’ as she would say! 👍🏼👍🏼✌️❤️”
“Blazing Entrails” was the third episode of the fourth season of Ren and Stimpy. It originally aired on Oct. 15, 1994, on Nickelodeon. In the episode, Ren forces pal Stimpy to go to a doctor after he displays weird symptoms. Enter the green-skinned Dr. Brainchild (voiced by Mumy) and his one-eyed mom, BrainMother (Lockhart).
Lockhart previously played biochemist Dr. Maureen Robinson, and Mumy played her son, Will, on Lost in Space from 1965 to 1968.
Mumy once shared that being reunited with Lockhart nearly 30 years after they played a mother and son on Lost in Space was a “happy happy” highlight of his career. In a 1994 video interview, he said, “I just did a Ren and Stimpy not too long ago with June Lockhart, and that was one of the high points of my career, being a part of that show.”
That same year, Lockhart told The Chicago Tribune that she was thrilled to do the voice-over role on Ren and Stimpy, because it was her favorite show at the time. In fact, she even approached the producers on her own.
“I am such a fan, I try never to miss an episode,” the actress revealed. “I phoned them one day and asked if I could come by and talk to the animators. They asked me to play a part and I said, `Yes, in a New York minute.’ It’s as awful as all the wonderful Ren and Stimpy things can be.”
Lockhart died on October 23 at age 100. Mumy paid tribute to her in an Instagram post, describing his late co-star as one of his “very favorite moms.”
This story was originally reported by Parade on Nov 2, 2025, where it first appeared in the Entertainment section. Add Parade as a Preferred Source by clicking here.
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