18 - Tom Swift and the Visitor From Planet X by Victor Appleton

20 - Tom Swift and the Visitor From Planet X by Victor Appleton

A mysterious visitor from outer space arrives as pure energy. Tom must protect Exman from spies and disasters in one of his most thrilling space-age missions.

19 - Tom Swift and the Visitor From Planet X by Victor Appleton

A mysterious visitor from outer space arrives as pure energy. Tom must protect Exman from spies and disasters in one of his most thrilling space-age missions.

18 - Tom Swift and the Visitor From Planet X by Victor Appleton

A mysterious visitor from outer space arrives as pure energy. Tom must protect Exman from spies and disasters in one of his most thrilling space-age missions.

17 - Tom Swift and the Visitor From Planet X by Victor Appleton

A mysterious visitor from outer space arrives as pure energy. Tom must protect Exman from spies and disasters in one of his most thrilling space-age missions.

16 - Tom Swift and the Visitor From Planet X by Victor Appleton

A mysterious visitor from outer space arrives as pure energy. Tom must protect Exman from spies and disasters in one of his most thrilling space-age missions.