|This article belongs to the Reboot Continuity|
Roundabout: Part 2 is the one hundred and twentieth episode of Ben 10.
Gwen, Grandpa Max, and Phil tracked down Ben in an underground lab. They try to dissuade him from joining forces with Forever Knight. With Ben's help, Forever Knight opened a time portal to travel back in time. He wants to prevent the signals sent by aliens to Earth to make contact to be answered. Because then there would be no Omnitrix watches and therefore no aliens.
- The Forever Knight's plan is revealed: he intends to change history and prevent aliens from coming to Earth.
- Kevin and the Forever Knight get trapped through space and time.
- Ben rejoins Team Tennyson out of regret.
- It is revealed that Max and Phil were the reasons aliens kept coming to Earth.
- Vin Ethanol and Simon Sez join Team Tennyson.
- Billy Billions and Charmcaster are taken into custody.
- Stinkfly gets removed from the playlist and is replaced with a new alien.
- This is the first season finale in which the Omnitrix didn't get upgraded or change appearance.