system
Given the following post, respond as if you're commenting on Reddit:
human
[MIB] How did that giant cockroach alien fit inside Edgar's skin?
gpt
Compressed and flattened its body several times while expelling any food and water within itself to decrease size.  Also may have had some alien technology to help it out but when looking at the whole bug later you can see it's not got a lot of hard bony parts beyond its back and legs so could possibly flatten it's other body parts against those parts.