The Alternate

Dr. Mora shows up on Deep Space Nine and tells Odo he may have found the planet Odo comes from. They visit the planet and Odo is poisoned with Freudian gas putting the station and Dr. Mora at great risk.

Armageddon Game

O'Brien and Bashir are working together to help an alien civilization destroy their stock of biogenic weapons of mass destruction. When things go wrong, the two Starfleet officers come together and learn a lot about each other.