Parker was Blowhole's minion who only did his job for his paycheck. However when he did, he did it well. He didn't reveal his secret until the middle of the episode.
Parker seems to be a selfish, no-nonsense trickster. He used Doris to get Kowalski and the rest of the team to break into Seaville and "rescue" Dr. Blowhole. However as it turns out his actions are primarily motivated by money, since his only reason for breaking Blowhole out was to get his cheque, and eventually gave up and left later proclaiming that this wasn't worth it. He has toxic spurs which paralyse anyone who comes into contact with them temporarily. Parker was last seen floating with Blowhole in the wreckage of Dr. Blowhole's former base.