I use Audacity. It can change voices in pitch, tempo, speed, etc. It can't do accents or anything like that.
You should be able to find voice actors here on the Artemis forums. Just ask. Try to give them sparkling, witty dialog.
You can have wormholes suck named objects toward them. Simply create the objects at known locations and do all the vector calculations before writing the script. You can also make asteroids as generic objects that get sucked slowly toward your wormholes. It's possible to do it with mines and nebulae but it would take a lot of programming (creating and destroying each one individually to simulate movement).
"Damn the torpedoes! Four bells, Captain Drayton!"
(Likely actual words of Admiral David Farragut, USN, at the battle of Mobile Bay. Four bells was the signal for the engine room to make full steam ahead).