Dr. Leviathan.

"Am I sitting?"
- Dr. Leviathan.
Plus-sized food analyst with the U.S. Department of Agriculture consulted by CONTROL while investigating Operation Starch, a KAOS plot to destroy America's potato crop.

Portrayed by Pat Houtchen [Episode #88: "Snoopy Smart vs. the Red Baron"].

Reality Check: The original Leviathan was an Old Testament sea monster. By extension, the word refers to anything large or massive.