Earth-21

Earth-21 is the Earth in which Hannah's series take place.

Overview
Earth-21's timeline is mainly identical to the original timeline, following:
 * 2005: Ben is 10. (Original Series)
 * 2010: Ben is 15. (Alien Force)
 * 2011: Ben is 16. (Ultimate Alien, former half of Omniverse)
 * 2012: Ben is 17. (Latter half of Omniverse)
 * 2015: Ben is 20. (Transformative)
 * 2025: Ben is 30. (Ben 10,000)
 * 2037: Ben is 42. (Ken 10)
 * 2040: Ben is 45. (Ultimate Alien's 10,000)
 * 2043: Ben is 48. (Omniverse's 10,000)

Timeline 10
The timeline in which the original canon up until A New Dawn takes place. In this timeline, Omniverse's Ben 10,000 is the future.

Timeline 21
The timeline in which most of the original canon, plus Transformative and Sasha & Serena's Solar System take place. Some past events happen differently in this, such as:
 * The events of The Secret of Chromastone never happening, and Mor' Otesi existing.
 * The events of The Rooters of All Evil and Weapon XI never happening with Osmosians being a real species.
 * The events of From Hedorium to Eternity never happening.
 * The events of Universe v. Tennyson never happening.
 * Zvezda being the Celestialsapien origin planet, the Forge of Creation being an artificial sanctuary that most of the kind have migrated to.
 * Celestialsapiens being able to be killed through normal means (i.e. if you stab it hard enough and it doesn't yeet your ass fast enough it'll die).
 * Ascalon was destroyed by Azmuth, and Diagon's energy was returned to his dimension.
 * There are many seals on many planets, all potentially leading to Diagon's freedom.
 * There were thousands of Lucubra on Earth, and while most were resealed along with Diagon, at least one remained.
 * Many aliens have different appearances to canon.

Timeline 23
The timeline in which Ben Tennyson is 14, and never took off the Omnitrix; Max Tennyson died early on in this Ben's history.

Timeline 33
The timeline in which Ben Tennyson went insane with Ascalon's power in The Ultimate Enemy, and merges his Ultimatrix with its power. This malfunctioned, and deformed his face, although granting him a large powerset. This version of Ben later renamed himself to Eon. The Hooded Avenger - an Omnitrix-wielding Julie Yamamoto - also exists in this timeline.

Timeline 34
Little is known about this timeline, although rumours have spread across Timewalkers. Any Timewalker who enters the timeline has never been seen returning.