An Infestation.

With a bang, the door flew open and a woman dress who was dress in black from head-to-toe. She wore a smug on her red lipstick lips and threw her hands into the air in a dramatic manner. "I'm back!" She chimed and took a step foward into the room, "Well, what'd I miss?"

In the room, the tension grew as all of the emotions said her name. "Depression!" And in response, she smirked at all of them.

"The one and only, kiddies."

***
Thomas Sanders lives a happy life, with his Personality Traits as his guides. Logic looks at things with a mind; Morality looks at things with the heart; Princey looks at things with creativity; and Anxiety looks at things with fear and doubt.

But long ago, all of the Traits hid a dark infestation in a dark, locked, forgotten room in the back of the Thomas' mind. But when Anxiety went and messed with the room, he let Her out.

Now it's up to the Traits to defeat the infestation and destroy Her before she effects Thomas' outside life. But how can you defeat a virus when She's controlling the one you love?