Missed the earliest parts, but;
Conner is attacked, his "parents" bring him to W&H, Angel rebuffs him, liason says it wasn't the SP's doing, but someone else.
Demon's attack Conner, they fight them off, Angel learns they belong to Warlock Blah (not his real name

. Warlock Blah is the leader of the Alter Memory ritual, and wants that Warlock ina bottle killed, and Conner is the one prophesied to do it.
There's a Plot Device, er... window cube thingee, the Plot Device can restore altered memories to someone if it's broken.
During all this, Wesley becomes more and more curious of what is going on, and of course Angel won't tell him.
Conner is locked in a room with Warlock in a Bottle, during the fight he's losing, until Wes confronts Angel, and ends up breaking the Plot Device. Conner kills Warlock in a bottle.
Oh, and Wes thought Angel did the mind wipe as a deal with W&H, offering up Fred in exchange.