the son of Tom Swift, Sr. and Mary Nestor. However, this series combined elements from both Tom Swift Jr. and the 1980s Tom Swift series in making their new Tom Swift. Ultimately, the new Tom Swift series struggled to match the success of its counterparts, even when a crossover spin-off of its own with the Casefiles series was launched. The series ended in 1993, with thirteen titles and two cross-over books being printed. List of titles The Hardy Boys/Tom Swift Ultra Thrillers This was a spin-off crossover series with The Hardy Boys Casefiles, similar to the Supermystery series (which was a crossover The Hardy Boys had with Nancy Drew). The Hardy Boys' Franklin W. Dixon pseudonym was the only one attributed to this series, though it was produced by Bryon Preiss. Time Bomb (August 1992) The Alien Factor (June 1993) References Tom Swift Young adult novel series Juvenile series Children's science fiction novels