Angel, a Spin-Off of Buffy the Vampire Slayer, ran for five seasons on the WB Network (1999-2004). Part melodrama, part Fantastic Noir, with a helping of comedy (a given for Whedon), Angel ran for a respectable five years but never quite escaped the shadow of its parent show.
The eponymous hero, Angel, is a troubled man who can't accept the bottom line on vampirism. (Killing people is in the job description.) A gypsy curse gave Angel his soul back — along with two centuries' worth of guilt for all the lives he's taken. On Buffy, Angel learned he could make amends for said crimes and left to pursue redemption on his own. He soon cobbled together his own West Coast Team (albeit on the same coast) and formed a detective agency to battle the forces of evil. And their lawyers.
Over the course of its run, the show experimented with Monster of the Week episodes laced with a hard-boiled, Sin City atmosphere, but later jettisoned it for something more akin to Urban Fantasy. The overarching plot became a meditation on the nature of good and evil, with Angel serving as an enigma on both sides. Much like Buffy, Angel switched directions on a semi-regular basis; by the fifth season, of the original starring cast of three, only David Boreanaz as the title character remained. That being said, several Buffy alumni wound up migrating to Angel, totaling out at five by series' end. (Not counting numerous crossovers within the 'verse.)
Despite its arc-driven and not-especially-accessible nature, Angel nevertheless gained a devoted following that included numerous high-profile television critics. While the network cancelled the show abruptly during its fifth season, Joss and Mutant Enemy still had enough time to put together a Grand Finale, which ended up topping the Buffy finale in terms of viewers. If you measure the uninterrupted 110 episode run of Angel against Whedon's other shows, it is actually one of his strongest, something which surprised Joss himself.
Angel has, to one degree or another, greatly influenced Torchwood, which could be considered its British equivalent. Just compare the page images.
Angel's adventures continued in a comic named "Angel: After The Fall," published by IDW. Its tropes can be found here, though that page is a work in progress. Dark Horse Comics currently publishes the latest continuation, an ongoing series with Faith called Angel & Faith.
Like its parent show, Angel contains loads and loads of trope examples:
- Angel Investigations, we hope you're helpless!