Sym-Bionic Titan (2010)

Season 1: Episode 9

When Modula finds another deadly beast to unleash upon the group, Lance, Ilana and Octus find a cuddly little alien they kept as a pet. However, they soon discover that the cute creature isn't all what it seems. The creature is generating enough energy to wipe out Earth, so the trio reluctantly let their beloved pet die peacefully in a glorious burst of energy. At an astronomy center, Octus locates a nebula cluster where they let their pet go, which the scientist of the station allows them to name for discovering it. In agreement, they come to name the cloud Tashy 497, as a mix of the names they wanted to name the creature.