Debbie, also called the Bloop after the only sound it ever made, is a chimpanzee-like character on the original 1965 television series Lost in Space. Debbie first appeared in season one in the episode "Island in the Sky." Debbie is a native of the planet Priplanus and was discovered after the Jupiter 2 crashed there. She was found by Don and given to Penny. Debbie also appeared in a number of season two episodes; she is shown in cameos in a couple of season three episodes, but these scenes are clearly footage from earlier episodes.

Debbie was played by Judy the Chimp; probably best remembered for her role on the TV series "Daktari."

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