Bumper is a young sperm whale calf who first appeared in the episode "Whale of a Squid". Martin thinks he is about one year old. Bumper likes to bump into things (hence his name) like the Wild Kratts' Amphi-Sub. When he tries to help Martin and Chris escape from a colossal squid when they were saving his mom but a bull sperm whale (possibly his dad) arrives and eats the squid. He is later reunited with his mom. He also appeared in the episodes, "Seasquatch", "Aye Aye", "Capture the Fishmobile" (with his mother), and "Sea Otter Swim". His mother made an additional appearance in Creatures of the Deep Sea Part 2.