In the third season of Angel, the titular vampire with a soul was forced to stand alone thanks to the (temporary) death of his beloved Buffy and her show's move to a new network, with no crossover between the two allowed. He returns from seeking peace in a demon-haunted monastery to find the L.A. Angel Investigations team fighting supernatural crime in his absence. Fred is still haunted by the nightmare dimension from which they rescued her; Cordelia's visions get ever more painful and debilitating. The schemes of the evil law firm Wolfram and Hart become every more imaginative and dragon lady Lilah Morgan becomes even more of an enemy when lusting after Angel. Unbelievably, Darla, Angel's vampire sire and lover, turns up, pregnant with his child and is tortured by inexplicable motherly feelings as well as a raging thirst for human blood.
The second season of Angel saw the cult vampire show finally stand on its own from Buffy the Vampire Slayer, assembling all the members of the show's core cast, transferring the action to a fashionably run-down L.A. hotel, and bringing in a few Buffy characters from Angel's history to further establish the moody vampire's own mythology. Moving their Angel Investigations to posher digs, Angel (David Boreanaz), Cordelia (Charisma Carpenter), and Wesley (Alexis Denisof) were soon joined by street fighter (J. August Richards)--and by street fighter, of course we mean demon street fighter. But just as this group was solidifying, up popped Angel's old love, Darla (the fantastic Julie Benz), freshly arrived in L.A. from a hell dimension? just in time to be turned into a vampire again by her old cohort, Drusilla (Juliet Landau), and lure Angel into abandoning his newly formed team.
He's hunky, he's brooding, he's a do-gooder, and he was Buffy's first boyfriend. Angel, the tortured vampire destined to walk the earth with a soul, got his own series after three seasons on Buffy the Vampire Slayer and did what any new star might do: he moved to L.A. (the City of Angels--get it?) and set up shop. Angel (co-created by Buffy mastermind Joss Whedon) finds the titular vampire (David Boreanaz) as a kind of supernatural private investigator, fighting evil one case at a time and, like his ex-girlfriend, keeping the world from getting destroyed by vengeful demons and such.