The Sims 4 cheats Get to Work features the new Alien life state. These extraterrestrials hail from the planet Sixam, which is a secret lot in the Expansion Pack.

Abductions happen at random, but can be encouraged or discouraged via the satellite dish that comes from the Scientist Career. Sims who are in this Career reportedly have a higher chance of being abducted. For players who don't want to have a Scientist just to experience abductions or reduce them, I offer the following cheat:

  1. Control + Shift + C
  2. bb.showhiddenobjects
  3. Enter Buy Mode (F2)
  4. Type 'satellite' into the search box
  5. Satellite in misc electronics will appear - place it
  6. Now you may either stop abductions for 24 hours by clicking it, or make a Sim more likely to be abducted by selecting 'Contact Aliens'

Male Pregnancy
Male Sims who get abducted may get pregnant while in the UFO - any male from Young Adult to Elder. This can result in unwanted babies. If your Sim is abducted and you want to raise the baby, see the guides to Babies and Children. The resulting baby will be pure Alien, and have access to Alien powers.

Once the birth is over, you can click the baby's bassinet to send it back to the homeworld. It can only be done at this stage of life, so decide whether to keep it early. This will make it as though the birth never happened. If you neglect it, child services will take it away, just as they do a normal Sim baby. There is a special birth certificate you can find in your Sim's inventory after birthing the baby.

Alien children

Despite being male, Sims who have babies via abductions can breast feed. Alien babies have a very, very alarming echo-y cry that can really affect you when wearing a headset. Trust me. Give the babies what they want and stop that crying ASAP.

Alien Life
Aliens have the same life span as regular Sims, and must attend school as usual. When two Aliens meet, they can perform a secret handshake. All Aliens have a disguise, which can be removed, activated, or altered at any time by clicking on the Alien. This will let you change how they appear when using the disguise. If you want to change your Alien into normal Sim clothes (without the disguise) you have to go shopping. Every Alien outfit looks the same.

Sims who meet Aliens can be angered, as though the government should have told them about Aliens. Once they're over it, Sims and Aliens can make good friends or even fall in love and try for baby. Aliens have a special mischief interaction, 'Scare with Probe'.