Star Trek: Gateways
Star Trek: Gateways was a crossover event, published by Pocket Books in , devised by Robert Greenberger and Pocket editor John Ordover. 

The Iconian gateways, scattered across the galaxy, have begun to spring into life across time and space. In the late 24th century, aliens claiming to be the long-lost Iconians have contacted the major powers of the Alpha Quadrant, offering the secret of the gateways to the highest bidder. 

The crossover involved the crews of all of the major novel series active at the time, including an abortive launch of Star Trek: Challenger. Each novel within the crossover ended on a cliffhanger, which was resolved in the final story collection What Lay Beyond. Co-creator  Greenberger later acknowledged the criticism that arose from this move, noting that "[in] retrospect, this was not a good idea and people have come to resent the series because of the caper costing twenty-four dollars after investing in six five dollars and ninety-nine cents books." ()

Novels 
 TOS: 
 Challenger: Chainmail
 TNG: Doors Into Chaos
 DS9: Demons of Air and Darkness
 VOY: 
 New Frontier: Cold Wars
 What Lay Beyond
 Epilogue: SCE: Here There Be Monsters

External link 

cs:Star Trek: Gateways
de:Portale
nl:Star Trek: Gateways
Gateways