Professor Bob is an evil scientist who appeared at the end of Operation: A.R.C.T.I.C., having created a weather-control machine which he planned to use to make an eternal summer of sorts, so kids will never have a snow day again. Sector V was on their way to stop them, but got mixed up with Triple Extra Large instead. Honestly though, I wouldn't mind an everlasting summer, but I can see that backfiring also. Otherwise, Bob is present during villain meetings, we don't see how his plan turns out.
"In the game of chess, you can never let your opponent see your pieces." -Zapp Brannigan