I would use the activity set “space and aliens” aimed at infant classes.
I would begin by reading the book “aliens love underpants” as a stimulus to this lesson.
We would discuss what the aliens look like, how many eyes, arms, hands, etc. Discuss the colours and sizes of aliens I the story.
We would then discuss where aliens live. I would introduce the planet song from YouTube to teach the children abit more about the planets. We would discuss the most suitable planets for aliens to live on, giving reasons for out choices.
I would ask the children to design/draw their own alien and to give it a unique name.
Finally, I would do a construction/STEM lesson where the children would design and make a suitable home for their alien to live in.
We would conclude by letting the children intoruduce their alien, describe his/her unique features etc. Then they would describe the homes they have created for their aliens.