Erik Adamkinson is a character who first appears in "Everything's Jake." He is the scientist that points out that if Jake were to go to the outside world, his flesh would reconfigure, killing all the Jake People in his body. When Jake is imprisoned, Erik leaves for the Glob world by climbing up to and out of the famous Sky Hole. On the other side, Erik sees Finn sloppily eating spaghetti, begins crying about how hideous the "Globs" really are, and melts into Jake's body.
- The Doctor's voice is similar to another character Billy West voiced, Professor Hubert J. Farnsworth from Futurama. He also appears to be older than his father, similar to how Farnsworth is older than his uncle.