Blukic and Driba (Seasons 1, 2, 3, 4, 5, 6, 7 and 8)
“Recurring”
Khyber (Season 1, 2, 3, 4 and 8)
Malware (Seasons 1, 2, 3 and 8)
Dr. Psycobos (Seasons 1, 2, 3, 4 and 7)
These quotes come from Wikiquote's Ben 10: Omniverse pages and are available under the Creative Commons Attribution-ShareAlike License.