no. 9, Hal Spacejock
This book can be downloaded and read in Apple Books on your Mac or iOS device.
Hal and Clunk answer a distress call, and they discover a fellow pilot stranded deep inside an asteroid field. Clunk is busy at the controls, dodging incoming rocks, so Hal dons a spacesuit, takes the jetbike and sets off on a heroic rescue mission.
If he'd only known the trouble he was getting himself into, he wouldn't have bothered...