- Beyond the Earth 9
- Hurtling Danger 17
- First Stop—Luna 25
- The Curious Boy 37
- Pelting Stones 47
- Into Space Again 59
- Invisible Menace 73
- The New World 83
- A Cry in the Night 99
- School on Mars 111
- Yank 123
- Illness Strikes 135
- News for Randy 147
- Peril in the Night 159
- The Peril Continued 169
- Disappointment 181
- Yank in School 193
- Trouble in the Air 203
- Terror in the Night 215
- Lost Underground 227
- A Struggle Against Time 237
- Of Days to Come 251
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