[nyrath]

Originally Posted by DMcCunney

Hmmmm. Yes. And The Vortex Blaster is set in the Lensman universe, but not part of the Lensman sequence.

Another stand-alone space opera from Smith is The Galaxy Primes.

I personally found The Vortex Blaster to be a fine addition to the Lensman universe. If you like other Lensman books, you'll like Vortex Blaster

I personally found The Galaxy Primes to be disjointed and tedious.

YMMV