The second part of a storyline started in the Buffy episode The Harsh Light of Day, In the Dark begins with Spike crashing into LA searching for the mystical Gem of Amarra, a ring which renders the vampire wearer invincible and able to walk in sunlight. Spike previously got hold of the ring but Buffy managed to retrieve it, asking Oz, who was heading to LA for a gig, to give it to Angel.
As with the two episodes before it, In the Dark is another mix of comedy and gruesome horror. The opening scene, in which Spike narrates what Angel and his latest damsel in distress Rachel are saying is absolutely hilarious. His various quips, "off to the Angelmobile, away!" "I'm almost out of that nancy-boy hair gel I love so much" are so funny.
Oz and Spike fit into the LA setting well and it only takes another 4 years for the latter to become a regular.
Marcus is also a very creepy villain. A silent torturer with a thing for children, he eventually gets hold of the Gem and goes to a beach, planning to prey on little kids.
There are also some hilarious scenes where Oz tells Angel how pale he is when he's in the sunlight and one where Spike's hair accidentally catches on fire.
All the cast give brilliant performances and the final scene, in which Angel smashes the Gem, is heartbreaking. A stand-out episode and a real Angel classic.