Star Trek: Hidden Frontier 2x5

Investigating the destruction of the terraforming vessel Encke in orbit of Osiris III, the Excelsior takes aboard Mission Specialist Corey Aster, an old Academy classmate of Ro and Rawlins. Ro is made uncomfortable when he realizes Aster still has feelings for him that he demonstrated while at the Academy, but the two are soon working together to identify what really happened to the Encke.