Out of Commission

Out of Commission is the final mission of the "Revenge" ending of the storyline of Grand Theft Auto IV. After the wedding and the murder of Kate McReary at the hands of James Pegorino, Little Jacob is planning Niko's revenge. After receiving Jacob's call to start the mission, the player will hear the GTA IV main theme on the radio upon entering a vehicle.

Walkthrough
Get to Jacob and Roman in a car in Koresh Square. Get inside. Jacob and Roman point to a mysterious car nearby; they're Jimmy Pegorino's men. Make a U-Turn. It looks like a U-Turn is impossible, but Jimmy's men will shoot the car's tires up a bit to make this U-Turn easier. Drive after Jimmy's goons. They will weave on and off the highway, so drive carefully and make sure to keep up. After a few minutes, the chase will finish in Northern Alderney near Leftwood. Be careful not to send the car into flames by then or you'll fail.

The target vehicle drives to an abandoned casino, Pegorino's apparent hideout. A cutscene shows Niko's car sliding to the side and stopping. Niko, Jacob, and Roman get out, take out their weapons and gain cover behind the car. Niko tells Jacob to take Roman home and take care of him until Niko really needs their help. Jacob and Roman run away as fast as they can and leave Niko to clean up Pegorino.

Get cover behind the trunk of the car and take out the men on the casino roof. After that, run closer to the casino and use one of the crates of salt as cover. Finish off as many goons as you can. Remember that grenades and a rocket launcher will help to get the last of them. Make sure there are no goons left standing, and then walk to the door at the front of the casino. Get cover on the right side of the door. There is also another easy way to complete this part. Go up to the steel fence and take out your rocket launcher and blow up all the goons' cars with it. This will kill most of them. then take your M4 Carbine or AK-47 and blast the other of Pegorino's goons. Then blast into the mansion

Use an Assault Rifle to take out most of the men. If there are any goons hiding, use a rocket launcher to finish them off. Once most, if not all of them are dead, run inside and get the first aid kit on the left wall if you need it. Kill the last of the men and go to the big hole at the back left of the casino. The other way to finish off the goons inside is to go to the back of the casino and find a ladder there. Climb it and climb the roof there. Then, kill the goons inside from the holes. You won't lose a single piece of health.

Cutscene: Pegorino will run up some stairs screaming, "You idiot! Don't think for a second that this was anyone's fault but your own!" Then he leaps out of the sky door.

Chase him up the stairs and out onto the roof. Don't shoot Jimmy - he has infinite health at this point so you're wasting bullets. Focus only on killing the goons - some of them have a nice, bloody death.

Slide down the stairs up ahead and gain immediate cover. Use a strong firearm to take out the last of the men protecting Pegorino. Take out a rocket launcher once Niko rounds the corner to take out the goon's car. Another way is that you can go down the ladder after killing the goons up and use a "chaos strategy" to waste the other goons. Keep running left and right but straight and keep shooting the goons and not wasting time by taking cover and all that. Once the goons on land are dead, two of Pegorino's guys will come up in a car and try to do a drive-by at you. Take your M4 or AK and shoot at the car. It will turn upside down, and once the goons come out of the broken car, shoot them while they are opening the doors. Not a single piece of life wasted.

Find Jimmy in a nearby boat and get on the motorcycle beside it. Stick to the coastline - don't lose Jimmy! It might be a bit hard to drive on the sand but don't worry about it.

As you are chasing Jimmy, you might see Roman and Jacob's helicopter passing over Niko's head. Roman explains that he will chase and kill Jimmy but Niko says "Not without me you're not!" Accelerate and go off the ramp highlighted on the radar.

Cutscene: Niko ditches the dirt bike and grabs onto the chopper's platform.

Work your way onto the helicopter and Niko will take the steering. Fly at a medium altitude - don't fall into the water! Pegorino will shoot several rockets at the chopper; try to hold your ground. Once Jimmy has one rocket left, Jacob will use his own rocket launcher to send the boat in flames. The sharp blow causes Pegorino to fall over and accidentally smash the trigger of his launcher, blowing up the heli as well in a surprising turn of events.

Cutscene: Both the boat and the helicopter lose control and brutally crash at Happiness Island.

There will be a few of Pegorino's goons on the island. Finish them off and you will automatically get a two-star wanted level.

Approach Jimmy at the side of the Statue. Get any weapon and kill him like you would kill any person on the street. Or you could kill him while he is running.

Cutscene: Niko explains to the dying Pegorino that the Old Families thought that Jimmy was "a fat fucking joke." Niko turns around and laughs hysterically. Jimmy, with his last strength, raises his gun in hopes of killing Niko. But Bellic turns around and uses the last bullet on his AK to shoot Pegorino in the head, killing him for good.

The credits roll and end with Niko saying "So this is what the dream feels like, this is the victory we longed for". If you're playing the PS3 version, you get a silver Trophy, You Won. If you're playing the Xbox 360 or PC version, you get an Achievement, 60GS You Won.

Tips

 * Fill your Assault Rifle as this will be the dominant weapon in this mission. Have at least half ammo on the SMG as well.
 * Find cover in heavy shootouts as Pegorino's men have heavy firearms.
 * Ignore the game prompt to stay low in the helicopter. If the helicopter is too low in an attempt to destroy Pegorino with the helicopter miniguns, the helicopter might sink into the river.
 * The following method is easier however will get Niko to lose more health. When the car skids to the side and Jacob escapes with Roman, go to the back of the casino. Climb up the back ladder and get rid of the three snipers on top. Use their spot to eliminate all of the men by the front of the casino. When all seems quiet, jump off the casino and proceed with the mission following the tips above.
 * If your a risky type or have full Health and Armor, go onto the roof of the Casino and proceed to the main "Roof" of the place. You should see some broken areas. Pop a few grenades and an RPG round for good measure and hop in. Look for the best place for you.
 * Go First Person during the helicopter part. Its much easier to dodge rockets since you can see them coming better. Remember to bank alot and change altitudes since just turning makes you an even bigger target.

Deaths

 * Jimmy Pegorino - the head of the Pegorino Crime Family and the man who killed Niko's girlfriend Kate at Roman's wedding
 * Pegorino's goons - they were meant to protect Pegorino but in this mission Niko ambushes them and kills their leader.

Trivia

 * Shortly after the mission, Niko will receive a call from Packie, who is hysterically upset over the loss of Kate, and tells Niko that he needs to be with his mother. However, sometimes if you contact him to do an activity after this call takes place, he seems to be calm and collect and apparently isn't at his mother's, almost as if the call and everything that led up to it didn't happen. It's shown during the credits of The Ballad of Gay Tony that he leaves the city which doesn't make sense since Packie claimed his mother needs him and she doesn't have anyone else. Shortly after, Niko will receive a call from Roman saying Mallorie is pregnant and if it is a girl, they will call her Kate.
 * A couple of days after completing the mission, Niko may recieve a call from Kate. She will ask Niko to take her on a date, as if she never died. If Niko accepts, the date will function as normal.
 * Even if you haven't got an AK-47, Niko will hold it in the last cutscene and kill Jimmy Pegorino with it.
 * There is a pigeon under the ramp when you do the motorcycle stunt to grab the helicopter railing. It is pointless to kill it, as it you will, eventually, fail the mission.
 * In the last cinematic, you can see in the sky an explosion, it was proved that it was the explosion of the Gawar of the mission Departure Time in The Ballad Of The Gay Tony.