High Quality Content by WIKIPEDIA articles! "Soul Purpose" is episode 10 of season 5 in the television show Angel. Written by Brent Fletcher and Elizabeth Craft, it was the directorial debut of David Boreanaz, who plays Angel, and was originally broadcast on January 21, 2004 on the WB network. In "Soul Purpose", guest star Christian Kane returns as Lindsey McDonald, taking on the deceased Doyle's name in an attempt to convince Spike that he is the vampire champion mentioned in the Shanshu Prophecy. Meanwhile, Angel slips into a feverish hallucinative state in which he dreams that his destiny of redemption is claimed by Spike.