A rather large moon is on course for a collision with Earth. Dr Shaw (Caroline Barclay) is sent with a team of space miners to drill tunnels into that moon, preparing its destruction with explosives. However, they discover an ancient hostile life-form 'within the rock', and then they are killed one by one. Their survival is not made easier by Ryan (Xander Berkeley), the captain of the spacecraft who wants to use the opportunity and run with a fortune of platinum they discovered, too.
To many viewers, "Within the Rock" (1996) looks like a rip-off to "Armageddon" (1998) but looking at the dates, it can't be. Instead it is borrowing a lot from the usual monster movie sources "Alien" (1979) and "Predator" (1987) as well as earlier collision stories, a classic sci-fi theme going way back for example to "When Worlds Collide" (1951). The spaceship, where they still use floppy disks in the control room, looks early 80s rather than mid 90s; even for a TV production the effects are quite embarassing. So are the characters, because they leave tons of powerful explosives in the crates while trying to hit the monster with a pickaxe. The predictable story may be OK to watch once, but you won't remember it next week.