Ultra-Thriller
The two volume Ultra-Thriller series joined boy inventor Tom Swift with the crime solving Hardy Boys, Frank & Joe. Although the Franklin W. Dixon pseudonym was used, the series was more akin to the then-current Tom Swift IV series.
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The two volume Ultra-Thriller series joined boy inventor Tom Swift with the crime solving Hardy Boys, Frank & Joe. Although the Franklin W. Dixon pseudonym was used, the series was more akin to the then-current Tom Swift IV series.