Pretend you're playing a game against a seasoned veteran player and are a few turns in. Your opponent has been using lots of blue energy and keeps benching cards, making you increasingly nervous. What if they're hiding some cards with the ability Develop, like Sea Monster and Monster of the Deep? You're starting to panic, but wait--! You've just drawn an Apocalypse. You're saved!
Apocalypse destroys all of the cards on both your bench and your opponent's, getting rid of all those scary cards that are making you nervous but also removing your own. Make sure you play all of your benched cards before playing Apocalypse, or you might accidentally get rid of your own allies!
Strong against: Quality decks with Develop cards, traps and benched actions.
Weak against: ally-heavy decks, which don't usually bench many cards, and Interfere.