Young Justice, Season 2: Invasion

Blue Beetle:
How are the ears?

Superboy:
Fine! Oh, ugh, fine. But what were you thinking using sonics against an Appellaxian?

Blue Beetle:
Dude. Never even heard of an Apple-laxative before tonight...

Superboy:
You freshman never do the homework. Haven't you read the case file on the League's first mission? Haven't you taken the guided tour of the Hall?

Blue Beetle:
Those are rhetorical questions, right?

Superboy:
The Appellaxians were an alien race of energy beings that attacked Earth twelve years ago. They inhabited elemental host bodies, including one made of crystal that could ABSORB AND REDIRECT A SONIC ATTACK!

Blue Beetle:
Oh. So, what were they doing inside the Hall?

Superboy:
The original seven members of the League drove the energy beings off-world. The empty husks the aliens left behind became the League's first trophies.