Bumper is a young sperm whale who first appears 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. He tries to help Martin and Chris escape from the 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".