Schrödinger's cat: "In quantum mechanics, Schrödinger's cat is a thought experiment that illustrates a paradox of quantum superposition. In the thought experiment, a hypothetical cat may be considered simultaneously both alive and dead, while it is unobserved in a closed box, as a result of its fate being linked to a random subatomic event that may or may not occur."
Tuna Sandwich (Kid Cosmic): "Don't let his love of sleep and tuna sandwiches fool you, this cat is the brains of the team. Thanks to his power he is able to see the future… if only there was some way he could tell the others." (official description)