Baz-El first appeared in Pier Pressure, where he crashed and spawned a symbiote named Ship to find help. Ship managed to follow a signal from the Omnitrix, and tried to get Ben's attention. He destroyed most of the pier and kidnapped Julie, only to be followed by Jetray. Ship then reveals that Baz-El was trapped in his ship while it was in self-destruct mode. He was saved by Humungousaur, and revealed Ship's reason for kidnapping Julie and bringing her to him. He wanted help from a Plumber. Before he left, he allowed Ship to stay with Ben and Julie.
In Eye of the Beholder, Ship was in an effort to rescue him, Baz-El reveals that he has a job scanning the atmosphere of various planets, and makes money on the side by stealing artifacts from the planets he visits which is how he earned the scorn of the inhabitants of the planet. He also revealed that, despite Ship being his son, he would sell him on the black market like the artifacts he stole, and proves himself to be very selfish.