Are There Aliens in Minecraft Xbox 360 Edition? (No – Here's Why)

No. Vanilla Minecraft (all editions) has no aliens. Mobs are fantasy/overworld/Nether/End creatures: zombies, creepers, endermen, blazes, wither, etc.

Aliens appear only via:

• Mods / Add-ons (Java Edition: Galacticraft, Advanced Rocketry; Bedrock: Marketplace "Alien Invasion" packs).
• Custom Maps / Adventure Maps with retextured mobs.
• Role-play servers using resource packs.

Xbox 360 Edition (Legacy Console) does not support external mods/add-ons; only official Marketplace content (discontinued). So zero aliens on that version.