Ben and Rook finds a kid in the neighborhood, they learn that this kid is Ben's future son, Ken Tennyson.
Now, learning that the Galvanic Mechamorph (Malware) has follow him in the past and tries to elimenate 16-year old Ben.
- Ben Tennyson
- Rook Blanko
- Kenny Tennyson/Ken 10 (voiced by Tara Strong): Ben's future son and future hero, he goes to the past to save his father in the past and re-captured Maware and his minions
- Gwen Tennyson (voiced by Rene O'Connor)
- Max Tennyson
- Kevin Levin
- Ken's friends
- Rev Steams (voiced by Will Friedle): A teenage Kineceleran and one of Ken's best friends in the future, he is the "fastest one in the city". Until, Ben 10, 000 beat him in a race.
- Petal Ponds: A teenage Methanosian and one of Ken's best friends in the future, she is eviromentist and hangs outside the city in the jungle preserve.
- MC Minnie (voiced by Nancy Cartwright): A teenage Sonarosian, famous deejay and one of Kens friends, she is love rapping and making a DJ scracthing sound.
- Boom Lou (voiced by John DiMaggio): A Tonesapien plumber and father of the Siren Sisters, he was doing maintaince check on the Earth's Plumber based and goes home sees his new born triplets. He doesn't his kids are criminals in the future.
- Malware (voiced by Corey Burton): A red, Galvanic Mechamorph who wants the Omnitrix for himself, he is tried of losing to Tennyson (Ben 10,000) and goes to the past to steal the Omnitrix.
- The Siren Sisters: A trio of female Tonesapiens working as singers for jazz club until they got fired, they began working for Malware. In the future, they were defeated by Ben 10,000 and were about head to jail until Malware help them escaped. They aid him of ridding Ben in the past.
- Decibel (Sheryl Lee Ralph)
- Melody (Ashleigh Ball)
- Liza (Andrea Baker)
- Echo Echo
- Voiceblast (scanning Boom Lou & first debut): A Tonesapien from the planet Aaah. A white bat-like alien with small arms, white mane-like hair and inside his mouth is purple, his powers is flying at 400 mph, echolocation, smart than a human, enhanced strength and powerful scream. His suit is black with a green stripe armbands and green sunglasses. Ben never bother talking in this form and only his son Kenny did.
- Crashhopper (accidentally, selecting for Alien X)
- Voiceblast (voiced by Neil Patrick Harris): A Tonesapien from the planet Aaah. A white bat-like alien with small arms, black messy hair and inside his mouth is purple, his powers is flying at 400 mph, echolocation, smart than a human, enhanced strength and powerful scream. His suit is black with a white stripe armbands and green sunglasses.