Serena

Serena is Alien X's voice of love and compassion. Due to her powers, along with those of Bellicus, she can warp reality. However, due to the weakness of the form that Alien X can do nothing unless a consensus is formed between herself, Bellicus or Ben, if he chooses to enter the form. She first appeared in X = Ben + 2. Paradox is not allowed to be closer than 500 light years to her and Bellicus, or any Celestialsapien for that matter.

Alien Force

 * X = Ben + 2 (first appearance)

Ultimate Alien

 * The Forge of Creation﻿ (first reappearance)
 * The Ultimate Enemy: Part 2 (Flashback)

Video Games

 * Ben 10 Alien Force: Vilgax Attacks

Trivia

 * Serena's name seems to have been inspired by the word "serenity" meaning peace.
 * In X = Ben + 2, she said she thinks Pluto should have been a planet instead of a dwarf planet. She even asked Ben to vote on it.