Arco Blathereen

Don Arco was an obese Raxacoricofallapatorian, and the patriarch of the Blathereen Family in the 26th century. After he hid in a toxic dump after being hunted by the Authorities, Don Arco could only breathe in poisonous gas.

Don Arco was behind the plan to turn the Justicia system into a massive flame-thrower, to burn other planets and sell the remains as fuel.

He was foiled, and killed by his relative Ermenshrew Blathereen for giving into the Doctor's demands so easily.

His body was later used by Ecktosca Fel-Fotch Heppen-Bar Slitheen and his brother Dram to hide in. (NSA: The Monsters Inside)