Grand Theft Auto 5 recently received its Gunrunning DLC update, and hidden within this latest content drop is the alien mission: Alien Egg Supply Run. This hidden alien mission is extremely time-consuming to unlock, so prepare for quite a grind!
Another thing to keep in mind is that you can only attempt the Alien Egg Supply Run once, if you fail, that’s it, game over.
How to Unlock the Alien Egg Supply Run

Unlocking the alien mission, Alien Egg Supply Run, will take you a very long time. In order to even begin the Alien Egg Supply Run, you must complete 600 Gunrunning sales missions. These Gunrunning missions are themselves easy enough to finish, but completing 600 will take several hours.
After you have finished the required 600 Gunrunning sales, you will need to accept a Gunrunning supply run between 21:00 and 23:00 in the evening – that’s 9pm and 11pm. The secret alien mission, Alien Egg Supply Run, should automatically be selected.
From here, you will begin the Alien Egg Supply Run, an extremely challenging mission, so be sure to fully equip yourself and come prepared for a fight.
Alien Egg Supply Run Mission
When the Alien Egg Supply Run mission starts, it will begin as a standard job to steal some supplies. However, as it progresses you will come across a crashed alien spaceship, it’s here where the Alien Egg Supply Run kicks off.
You will need to approach the spaceship and steal the alien egg, but the aliens will fight back. Be prepared to use all manner of weaponry against these otherworldly beings. Take your time, and be patient, as you only get one shot at this hidden alien mission.
Though it’s extremely tedious to unlock, the Alien Egg Supply Run mission is worth the effort, especially after all these years of mystery surrounding the existence of aliens in GTA 5.