Switching it up with the Victorious Rpg by Mike Stewart & Amazing Adventures! by Jason Vey , when last left our heroes my version had plane jumped into its new destination. An alien jungle world and things were getting very interesting at the old colony cities on this new plane. Last week the player's PC's heard blaster fire coming from the nearby cities and fires raging. That's when they came upon the Aldebarans raiders armed to their teeth with their own floating battle ship high in the clouds.
The Aldebarans are from
Fantastic Worlds #6 (Standard Comics, Novemeber, 1952).
These aliens are in the public domain
The Aldebarans are the worst aspects of goblinoids teamed with a highly motivated religious imperative combined with bits of a mercenary army AC 9  HD 1+1 Attacks Raygun (1d6+1, medium range) Move 12. These raiders are tearing across the countryside for parties unknown looking for an artifact one of six Eternity Crystals. The colonists have no idea where these things are. The Aldebarans are some of the worst scum of the universe & very much a menace from the coldest depths of Hell. They have no idea that Tegel Manor just dimensionally gated into the middle of their raid.
Many of the businesses,NPC's, etc. are coming straight outta Citybook I: Butcher, Baker, Candlestick Maker From Flying Buffalo so we've got a mix of anarchism Nineteen century & Middle Ages technologies, personalities,etc. This is something that dungeon master do all of the time. And my players come to expect it outta me on a regular basis.
The Aldebarans came straight outta of Light City Foes: Stardust From