BlackJack's guard worm is a guard worm who appears in the episode "BlackJack." He is owned by BlackJack.
BlackJack's guard worm is a big light green worm who has light red eyes with black pupils, and sharp, light yellow teeth. He wears a spiky metal collar attached to a chain.
Role in episode
When SpongeBob walks up to BlackJack's house so he can save his parents and comes to the porch and approaches the door, the guard worm reaches out from a rusty boat in the backyard. He barks at SpongeBob, who is easily frightened and says "Nice wormy."