CAPTAIN PEROXIDE. Buffyverse Term/Concept/Idea/Intratext.

As a designation for bleached-blonde, "Billy Idol wannabe" ("Sleeper") Spike, the name "Captain Peroxide" is first used by Xander in "Smashed":

 

(the phone rings, Buffy answers) Hello, Magic Box.

SPIKE: Slayer.

BUFFY: Spike?

SPIKE: Meet me at the cemetery. Twenty minutes. Come alone.

BUFFY: Spike?

SPIKE: (rolls eyes, mutters) Bloody hell. Yes, it's me.

BUFFY: You're ... calling me on the phone?

SPIKE: Just be there.

BUFFY: Why? Are you ... helping again? (Buffy speaks louder for Xander & Anya's benefit) You have a lead on this frost monster thingie?

SPIKE: Something like that, yeah. Thought you might be up for a little grunt work.

BUFFY: What?! No, (whispers) no-no grunting!

SPIKE: (grins) I was talking shop, luv, but if you got other ideas ... you, me, cozy little tomb with a view...

(she hangs up on him)

XANDER: So, what did Captain Peroxide want?

BUFFY: Nothing! (nervous) You know, he just, you know, wanted to see if I-I wanted to patrol, for, for the, the monster. But I, I told him that I ... would ... not.

Independently Angel use the same moniker for his rival-for-Buffy's-affections in "Chosen":

 

BUFFY: If I loseó if this thing gets past Sunnydaleó then itís days, maybe hours, before the rest of the world goes. I need a second front and I need you to run it.

ANGEL: Okay. Thatís one reason. Whatís the other?

BUFFY: There is no other.

ANGEL: Is it Spike? Youíre not telling me something and his scentÖ I remember it pretty well.

BUFFY: You vampires. Didnít anybody ever tell you the whole ďsmelling peopleĒ thingís a little gross?

ANGEL: Is he your boyfriend?

BUFFY: Is that your business?

ANGEL: Are you in love with him? (beat) Okay, maybe Iím out of line but this is kind of a curve ball for me. I mean, we are talking about Spike here.

BUFFY: Itís different. Heís different. He has a soul now.

ANGEL: Oh. Well.

BUFFY: What?

ANGEL: Thatís great. (sotto) Everyoneís got a soul now.

BUFFY: Heíll make a difference.

ANGEL: You know, I started it. The whole having a soul. Before it was all the cool new thing.

BUFFY: Oh, my god, are you twelve?

ANGEL: Iím getting the brush-off for Captain Peroxide. It doesnít necessarily bring out the champion in me.

BUFFY: Youíre not getting the brush-off. Are you just going to come here and go all Dawson on me every time I have a boyfriend?

--David Lavery