- Series: The Hardy Boys and Tom Swift Ultra Thriller Series Record # 27072
- Sub-series of: Tom Swift
- Webpages: tomswift.net
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Note: Also in series The Hardy Boys. Published in paperback only. TomSwift.net covers this crossover series along with the contemporary fourth Tom Swift series (Tom Swift [3]) and notes that its content is closer to Tom Swift, although it is credited to Franklin W. Dixon, pseudonymous author of The Hardy Boys.
- The Hardy Boys and Tom Swift Ultra Thriller
- 1 Time Bomb (1992) by Franklin W. Dixon
- 2 The Alien Factor (1993) by Franklin W. Dixon