What "Dexter's Laboratory" episode was this from?

[Corndog Ninja]

[img]http://sphotos.ak.fbcdn.net/hphotos-ak-snc4/hs1196.snc4/154825_1476304272262_1373387250_31063749_4227194_n.jpg[/img]

A friend of mine found this image, and was wondering what episode it originally was from. Could any Cartoon Network scholar help out?

[Kalibos]

I dunno but I can guess what's in that vial

[Vash_023]

Monstory: [url]http://www.dailymotion.com/video/x6xjp2[/url]

[PyneApple]

Oh god I just made the nerdiest noise laughing at that.

[WishesForFishes]

Oh hey Dexter's lab I remember that sho- OH MY GOD

[img]http://myfacewhen.com/i/519.gif[/img]

[MILKE]

Dont know the episode name, but I remember the episode as I watched it yesterday. Oh, sweet times..

It's the episode where dee dee gets transformed into a monster, and she tries to hide dexter everywhere.

[Colliseemoe2]

[QUOTE=MILKE;26489622]Dont know the episode name, but I remember the episode as I watched it yesterday. Oh, sweet times..

It's the episode where dee dee gets transformed into a monster, and she tries to hide dexter everywhere.[/QUOTE]

don't they both end up becoming giant monsters and battling?