Season 1

Lindsey McDonald is first seen in the opening episode for Angel, City of..

He works for Law firm Wolfram and Hart, who represent some rather dubious characters, perhaps the personification of 'Devil's Advocate'. It is obvious from the beginning that the Law firm, their lawyers and clients are far darker than the norm.

As Angel crosses more of their clients, Wolfram and Hart take an 'unhealthy' interest in the Vampire with a soul, with Lindsey as a key player. At one stage Lindsey has a 'crisis of faith' and turns to Angel for help in preventing the deaths of three special children. As a result he is, surprisingly, offered a promotion by the Law firm, and accepts it.

The final episode of season one sees Angel and Lindsey head to head. Wolfram and Hart have big plans, which include putting Angel's team in hospital, and summoning something into a large crate. Angel tries to prevent the summoning and battles the demon Vocha who was brought in for the proceedure. Whilst they are fighting Lindsey picks up the scrolls and completes the ritual. The crate and contents are wisked away leaving Angel and Lindsey to battle it out over the scrolls, which Angel needs to save Cordelia. Lindsey starts to move the scrolls toward a flame lantern, leaving Angel with little choice but to cut off the Lawyers hand. Angel leaves with the scrolls, leaving a bloody and angry Lindsey behind.

Season 2

Lindsey is not happy with losing his hand, and is out to get Angel in any way he can. He takes a personal interest in the 'person' summoned at the end of season one, Darla. He slowly falls in love with her, and finds himself having to vie with Angel for her affections. She wants her Angelus.

When Darla is reborn as a vampire, she and Drusilla attack a party being held by Holland Manners in his bunker basement. The only two to survive are Lilah and Lindsey, and they find themselves having to compete for Holland's job. Darla eventually leaves LA.

The law firm arrange a special operation for Lindsey, providing him with a 'new' hand. His hand seems to have a 'mind of it's own' and his investigation into where the hand is from finds him having to, reluctantly, work with Angel again. They discover a small lab were 'people' are kept in stasis chambers, barely alive. Their body parts are removed for use in transplants for the 'favoured' employees of Wolfram and Hart. Some of them are intact enough to be rescued, but for some death is their only release. The lab is torched, killing, amongst others, the unwilling doner of Lindsey's hand.

Lindsey quits Wolfram and Hart, and leaves LA.