The Season 9 episode, "Plankton's Pet", even showed SpongeBob voluntarily helping out Plankton by not just selecting a pet for adoption, but also searching for it after it goes missing.

Unified Police are asking the public to keep an eye out for an 18-year-old who is missing and considered "endangered." ...

When SpongeBob's parents go missing, he suspects that his cousin BlackJack, the family bully who used to torment him when they were little, has kidnapped them. While brushing his teeth ...