On October 12, 2153, Captain Jonathan Archer and Doctor Sam Beckett reciprocally leap in time, in this Quantum Leap crossover. 

Half a dozen characters are unceremoniously plonked into a mysterious room. Their only instruction is to help others. Meanwhile, characters from other universes are told to ask for advice. Will anyone be able to connect?

After ten years, Peter Kirk has returned to the lives of his uncle and the crew of the Starship Enterprise, raising questions, concerns and not some small amount of pain as the shattered young man is very obviously in bad shape. What will the crew do when what should be a joyous return from the dead turns awkward and off-putting?

A century before the Dominion War, the Ku'Vok-leth (The Honor Brigade) was a prominent military faction within the Klingon Empire. When the Empire and the Federation made peace, the Ku'Vok-leth became far less influential. Following the Dominion War, the Klingon High Council began turning a blind eye to the actions of the Ku'Vok-leth. Now, this anti-Federation group plans on using one of the biggest scientific discoveries, a single particle capable of destroying subspace, as a weapon.

Retired Starfleet captain Benjamin Sisko must reunite with his former colleagues to stop these Klingon radicals before they can cut off a strategically important star system from the Federation forever.

But this conspiracy turns out to be more than just a simple act of terrorism, as Section 31, the Romulan Star Empire, and the Dominion have a vested interest in the events of the next few days. And as the crew of Deep Space Nine come to learn, such a conspiracy reaches all the way up to the President of the Federation.

Season 2, Episode 11:

Earth is attacked. The Breen Confederacy, now in collusion with the Dominion, have a powerful weapon that could turn the war back in the Dominion's favor. The USS Lambda Paz is dispatched to Minos to harness a powerful weapon left behind by a long-dead civilization. But other forces seek to use this ancient weapon to advance their own goals.

Season 2, Episode 5:

The crew of the USS Lambda Paz is in a race against time to prevent a group of Human Augments from unleashing a deadly biological weapon on an historically significant planet within the Cardassian Union. While Captain Limis Vircona embarks on a daring rescue of Doctor Aurellan Markalis, she remembers how she had to overcome her hatred of Cardassians to avert a major catastrophe.

A powerful entity approaches Earth; Kirk and his crew must face both it and Trelane, who now calls himself Q.