"Grimly Fiendish" was a single released by The Damned in 1985.
The band had finally been able to negotiate a deal with a major label, MCA, and moved further in the direction of goth music under the influence of guitarist/keyboardist Roman Jugg and vocalist Dave Vanian. Given a substantial promotional budget, including a video directed by Jonathon Gershfield and two separate 12" releases (each featuring a different remix of "Grimly Fiendish") and several limited edition 7" variants, the song was the band's biggest hit since 1979, reaching #21.
The song takes its title (although misspelled) from a character - Grimly Feendish - The Rottenest Crook in the World - in the UK children's Wham! and Smash! comics from the 1960's. Grimly was an evil and generally incompetent and child-like criminal mastermind, who was often shown wearing a long, black coat.
Bonus Track on 12" single, version 1: -
Bonus Track on 12" single, version 2: -