---notes from that episode---
During World War II, Angel is coerced by The Demon Research Initiative into undertaking a secret mission: He must rescue an American submarine crew from three vampires (including Spike) who were captured by the Nazis as part of an experiment to create super-soldiers. During the mission, Angel is forced to sire a fatally-injured Sam Lawson in order for him to repair the submarine's engine, which was damaged during a German attack.
EDIT: A response from my buddy Kampfgruppe Cottrell :
It really depends on what kind of vamp you want to do. If you want to make it like in Angel just give them a -5 or 6 in close combat due to there strength and double or triple any throwing ranges. Say if he looses in CC and the opponent doesn't have something that can kill him the he is just knocked back and down a 1" away. Double their hearing range and allow them to see at night as if at day, also give them a -1 column shift for Sighting Checks. The only thing that can kill him would be a KIA or Gory Death with wood or some other weapon the series allowed for. I'd give him a a Morale of a Vet but the benefits of a Elite with an additional. He wasn't the Angel we knew in the series at that time so he may be just leave the battlefield instead of fight it out for humans. This lower Morale will represent his internal conflicts but still give him a big enough modifier to pretty much do anything he wants to do.
Daylight kills him auto so make sure it's a night game
Now that's just off my head so maybe that would be a good start,
I was a huge Angel fan but hate Buffy. Amy is a total Buffy FREAK!
---for those who did not see the episode the plot----
It’s 1943, and a submarine is moving through the Atlantic Ocean as its crew begins to panic. An officer named Lawson issues orders to the crew as their captain is suddenly grabbed and killed by an unseen creature.
In the present, Angel's team discusses the fact that Eve has vanished. Wesley is concerned about her threats of revenge, but Gunn thinks that the Senior Partners will take care of her for them. Angel wants to make sure that Lindsey is being punished as well, but Gunn notes that the white room is still empty, so they no longer have a link to the Senior Partners. The team is surprised that Angel is letting them go before midnight on a Friday, but, since they all still have work to do, they agree to meet up again in a few hours for another discussion. They split up as Lawson arrives in the building. Later, Fred encounters him in the science lab and is disturbed that he knows her name. She casually backs away, but he warns her that if she runs, he will have to stop her. He tells her that he’s an old friend of Angel from “back when he was in his patriotic phase.”
Back in 1943, a brooding Angel is sitting alone in a New York City apartment when a group of military officers armed with stakes burst inside. They represent a new agency, the Demon Research Initiative, and their goal is to recruit Angel to join the war effort. They need his assistance to rescue a German prototype submarine that has been commandeered by the American military (the submarine seen earlier). The crew ran into trouble on the way home and is now trapped in enemy territory. No human soldier can reach the sub because of the extreme cold and pressure at the bottom of the ocean (conditions that pose no threat to a vampire). Angel is initially resistant to participating, but it soon becomes clear that he has no real choice.
In the sub, Lawson and his surviving shipmates are barricaded into a small section of the submarine, temporarily safe but unable to control the submarine. As they evaluate their options, they are alarmed to hear a clanging sound in the tubes until Lawson recognizes it as Morse code: an SOS signal. They open the tube and discover Angel inside.
In the present, Lawson captures Wesley as he attempts to help Fred. On the submarine, Angel asks for the captain and is informed that he is dead and that Lawson is now in charge. Angel issues an order and provides a verification code to assure the crew that he is on their side. He heads for the hatch to confront the creature and comes face-to-face with a dark-haired Spike, clad in a black leather Nazi jacket. “Angelus,” Spike remarks. “They’ll let anyone in here.” Angel disbelievingly asks Spike if he is a Nazi; Spike says that he just ate one and took his jacket. Spike assumes that Angel was grabbed by the S.S. the same way he was - at a “free virgin blood party.”
Spike introduces Angel to the two other recently freed prisoners, vampires named Nostroyev and the Prince of Lies. When Spike learns that several humans are still alive, he wants to kill them; Angel forbids killing the humans because they need the crew to get back to the surface (“We’re underwater?” the confused Prince of Lies asks). Spike tries to prove that he can steer them out, but he just sets off an alarm. When Nostroyev insists upon killing all but one of the crew, Angel kills him. When Angel reiterates his demand that no humans be killed, Spike gives him the two-fingered salute and a “heil Hitler.”
In the present, Lawson confronts Angel in his office. Angel recognizes him and learns that Lawson has been keeping tabs on him over the past 60 years. Back on the sub, Angel introduces the crew to Spike and the Prince of Lies, telling them to put the vamps to work. Angel and Lawson move the dead crew members out of the way as Lawson says that he is not sure how to feel about Spike being there, since he killed the captain. Angel reminds him that they have to follow orders and bring the sub in. Lawson replies that “there’s a difference between orders and purpose.” He can handle dying, as long as it is for a greater purpose. Angel tells him that the job they do will help win the war, so they need to work together.
In the present, Lawson asks Angel if he only did what he did on the sub for himself. He wants to understand “why we do what we do.” Angel attacks Lawson and starts to stake him with a coffee table leg, but Lawson asks if he really wants to do that. Angel reminds him that the last time they saw each other, Angel promised he would kill Lawson the next time they met. Lawson says that he would never come to Angel without having something up his sleeve. He takes Angel to a conference room, where Angel sees that Wesley, Fred, and Gunn are all tied up and standing on office chairs. Lawson explains that the gang have wire around their necks, so if they get knocked off their chairs, they’ll be decapitated.
Back on the sub, the crew takes command of the submarine while Spike complains to Angel that he wants to steer the sub and be addressed as "Captain." Angel puts him to work and tries to assure Lawson that he can control Spike. They two hear screaming from the next room and rush over to discover that the Prince of Lies is beating up the captured Nazi. He and Lawson try to get the Prince of Lies away from the Nazi, but Angel has to stake him to stop him. Angel has to explain to Lawson that the Prince of Lies was a vampire. Spike points out that the Prince of Lies was holding a report in German and demands that the Nazi tell them what it contains. Lawson translates an impromptu interrogation while Spike "menaces" the Nazi officer, who reveals that the Nazis have been doing experiments on vampires, trying to learn how to control them. The Nazis eventually plan to use the controlled vampires in the Nazi army. Spike is furious about what the Nazis are doing, and assumes that the Americans have similar plans. Accordingly, Spike reiterates his desire to kill the crew, but Angel and Lawson stop him. Lawson insists that the Americans would never experiment on vampires or try to control them, saying: “You don’t win a war by doing whatever it takes. You win by doing what’s right.” Angel tells Spike to burn the report, which he does (while singing “God Save the King”), much to the dismay of the Nazi officer. By this time, Spike has figured out that Angel is playing both sides, and expresses both surprise and respect for the move.
They hear an explosion, and a distracted Spike accidentally sets his clothes on fire instead of burning up the whole report. Enemy destroyers are spotted and the crew tries the submarine, but after more explosions the sub is rendered motionless. The sub starts taking on water and Angel helps fix the pipes to stop the flow. As Spike notes that the Nazi has disappeared, Lawson looks for his screwdriver. He turns around and the Nazi stabs him in the stomach with the missing screwdriver. Angel tries to get the dying Lawson to tell him how to get the sub home. Lawson says that he’s the only one who is capable of doing what needs to be done. Angel vamps out and bites Lawson, then makes Lawson drink from him. Angel heads back to the main room and tells the crew to get ready to surface. The newly-sired Lawson repairs the sub and thanks Angel. However, he now wants to eat the rest of the crew, since he and Angel do not need them anymore. Angel takes Lawson to the main room and forces him to leave the sub, and swim the 20 miles to dry land. He warns him that the sun will come up in 8 hours, and tells him that if he ever sees him again, he will kill him. As Lawson leaves the sub. Spike laughs at Angel's actions, telling him that he is "still a dick," and is irritated when Angel also forces him to leave.
In the present, Angel tells Lawson that he never wanted to sire Lawson, but Lawson notes that it seems fair to sacrifice his life to help the Americans. Angel tells him that killing the gang will not change the past; Lawson says that it will hurt Angel, which might be enough for him. “It never is,” Angel replies. They fight, and Lawson accuses Angel of making him nothing because Angel gave him a little bit of his soul. Lawson tries to stake Angel, who turns the stake around so it is pointing at him. “Go on, Chief. Give me a mission,” Lawson says. Angel stakes him. The next day, Spike goes to Angel’s office, explaining that Fred filled him in on the events of the previous night. He thinks that Lawson was there for revenge, but Angel says that he came there for "a reason."