Tom Corbett Space Cadet #2

Tom Corbett and his fellow space cadets are captured by the alien Norbek and his men on an asteroid, but manage to escape their captors through a clever attack. After being rescued and returned to Space Academy, the cadets are assigned to set up a listening station on Asteroid Delta. When wolf-men attack the station and the cadets must defend it, they discover the creatures are actually hostile aliens trying to prevent them from establishing the post. Following a fierce battle, the wolf-men retreat, allowing Captain Strong to commend the cadets for their bravery and successful completion of their mission.