- AudiobookThe Swordsman of MarsOtis Adelbert Kline
- AudiobookThe Prince of PerilOtis Adelbert Kline
- AudiobookMaza of the MoonOtis Adelbert Kline
- AudiobookThe Outlaws of MarsOtis Adelbert Kline
- AudiobookThe Port of PerilOtis Adelbert Kline
- AudiobookPlanet of PerilOtis Adelbert Kline
- AudiobookThe Secret KingdomOtis Adelbert Kline