Last year this uberprolific underground MC (aka King Geedorah, aka Viktor Vaughn, aka Metal Fingers) collaborated with producer Madlib for Madvillainy, a dusty, disheveled masterpiece. This fall he and producer Danger Mouse released their highly anticipated debut as Dangerdoom, The Mouse and the Mask (Epitaph), a playful tangle peppered with skits by characters from Cartoon Network's Adult Swim lineup. It isn't quite the tour de force that Madvillainy was, but it's got the goofy, carefree charm of a Saturday morning spent shoveling down spoonfuls of Cocoa Puffs in front of the tube--Doom imagines the duo hosting Space Ghost Coast to Coast, Meatwad does a bit of Doom's "Beef Rapp," and Master Shake leaves a series of alternately outraged and contrite voice-mail messages, trying to land a guest spot on the album. ("Gimme a call! Fa-for the schnizzle. For to do the rap pizzle.") Danger Mouse's production is as crisp as Madlib's was hazy, his giddily catchy beats layered with strings, piano, horns, and what sound like samples and sound effects from old-school cartoons. On "Benzie Box" he tethers a corny Scooby-Doo-style "scary ghost" sound to a farting, trunk-rattling earthquake of a bass line, and Doom raps, "Sing a song of slaphappy crappiness / He came to blow like it was strapped to his nappy chest." Doom's got a thick, unhurried flow and a phlegmatic, almost drowsy monotone--you could call "slaphappy crappiness" a spot-on description of his delivery--and combined with his freewheeling, oddball rhymes it gives him the appealing ability to seem clever and oafish at the same time. He kicks off "Vats of Urine" rapping about himself in the third person ("Everybody talkin' 'bout pistols, gats is borin' / He came with a new topic to flip you, vats of urine"), then explores the wide world of pee-pee with lines like "If you was stranded out to sea alone and in trouble / Survive dehydration: guzzle your own cup full." Once you've seen a big doofy-looking guy in a metal faceplate talk about drinking piss, you can pretty much call it a night. Longshot and DJ PNS play second and Mr. Greenweedz opens. Sun 12/11, 9 PM, Abbey Pub, 3420 W. Grace, 773-478-4408 or 866-468-3401, $26, 18+.