Without his Kryptonite power source, Metallo is rendered immobile. But when the Kryptonite was removed in the Superman: The Animated Series episode "Action Figures", Metallo was still able to move, briefly chasing after it.
When Green Lantern is sealing the rift, Metallo is behind him and his right arm is extended, as it has been since Supergirl removed his power source. But when Green Lantern and S.T.R.I.P.E. fly off, Metallo's right arm is down at his side.
So where the heck are Green Lantern and S.T.R.I.P.E. when Metallo is stalking Supergirl? The battlefield is quiet, no sounds of combat, all the nearby troops are dead, and Supergirl is firing highly-visible blasts from an energy gun at one point. Shouldn't they like...notice her?
Stargirl lifts Metallo up and into a wall, and he slams her into the wall next to him on his left (audience right). But then he falls directly down and she lands behind him and to his right (audience left).
Trivia: It may or may not be a goof, but this is the first time in the WB animated universe that green kryptonite has been credited with healing powers. The healing effect here seems similar to the properties of green-k on the TV series Smallville where green kryptonite does...well, pretty much anything.
Deimos' tent is red from the outside, but in the interior shots the walls are gray.
When they have the long shot of the Leaguers and Warlord studying the villagers who are training, they're spread out, but then it cuts immediately to a medium-shot and everyone is practically standing on top of each other.
Deimos: You think you've won? No freedom-loving Warlord will ever unite the lands and bring peace. Justice: a foolish dream.
Warlord: Maybe so, wizard, but it's the one dream worth fighting for.
Warlord: Deimos! You and me, pal.
Deimos: (casually) Morgan - I was hoping to kill you today.
Deimos: Such a pretty child...but then they're always pretty when I begin.
Warlord: Back when I was in the Air Force, that energy stuff was science fiction.
Green Lantern: That explains why Morgan the Barbarian packs an auto-mag.
Stargirl: Geez, you call that an army?
Warlord: Most of these folks have lost everything to Deimos, so, you know, feel free to dump on them.
S.T.R.I.P.E.: If I was you, I wouldn't talk behind someone's back...when they have superhearing.
Supergirl: What are you waiting for? Zap 'em with your star thingy!
Stargirl: Oh, may I? Because it'd be such an honor to help the great Supergirl out of a jam.
Supergirl: Come on!
Stargirl: Uhhh, my dad.
Supergirl: I know – Superman tried to keep me on the farm. Made me hide there for three years.
Stargirl: Big deal, I've still got a curfew. Enough cosmic energy to trash a city and I can't stay out past ten.
Supergirl: Three years. On a farm. In Kansas.
Metallo: You have none of Superman's strength.
Supergirl: But I've got brains.
Deimos: My magic is strongest, girl.
Stargirl: Your breath is strongest, dude – that's about it.
Supergirl Fan: Don't you talk about Supergirl! Supergirl can nail you with her eyes!
Stargirl: Big whoop – my stepdad here is a Mecha.
Supergirl Fan: Ha! Mecha is so last year.
S.T.R.I.P.E's costume design changes from previous appearances. His suit is now smaller and more streamlined.
First aired on YTV in Canada on February 15, 2006.
Scenes at the end are from "To Another Shore" and "Flash and Substance."
Nicole Tom reprises her role as Supergirl. Malcolm McDowell reprises his role as Metallo from Superman: The Animated Series. The actor playing S.T.R.I.P.E. is uncredited, along with various other guest voices. Kim Mai Guest previously played Katma Tui in "Hearts and Minds" and is credited here as Silver Banshee even though she has no recognizable dialogue.
Supergirl's costume design is changed here from her previous appearances. It now resembles an early Bruce Timm style that was never used for Superman: The Animated Series, as well as the costume her newest incarnation in the comics wears (as of the time this episode premiered).
Working title: "Heart of Stone."
Giant Japanese Monster
The monster at the beginning is a clear parody of Gamera, a giant radioactive turtle that breathes fire, flies through the air like a saucer by firing thrust through its leg holes, and has a unceasing stream of little Japanese boys in shorts that like him. Although Gamera rivals Godzilla in popularity, he's probably best known as being a recurring target by the Mystery Science Theater 3000 crew.