Finally managed it.....heres how Before taking the mission, i built a huge fleet, keeping Kalast penned in on ATZERRI with smaller fleets on the surrounding planets ( Endor, Bespin and Bestine). Once I had my large fleet, I moved my smaller fleet from Bespin and combined it with my larger fleet. This gives the Rebels an option to take over Bespin (which they did, so splitting there forces). make sure the auto resolve is OFF. Then moved my large fleet onto Atzerri to start the mission....Kalast hyperspaces off...and then I was left to defeat the fleet he left behind. Mostly shed loads of Corellian Corvettes and a few Marauder Missile Cruisers. After I had defeated that fleet, a message was sent saying something along the lines that Kalast had a new improved ship and had hyperspaced out. I then got a message saying that now was a good time to try out the Empires new ship (the Interdicter) and that one was waiting for me at Coruscant. And there was one there. I incorporated the Interdicter into my fleet, and waited for Kalast to pop up again, about 2 minutes later, on a different planet. All that was left to do was to move my fleet to the same planet, initiating a space battle. During this battle I totally ignored all the enemy ships and concentrated on Kalast's ship. The ships I used were the Interdicter (start the gravity well as soon as possible) 4 x Victory class Destroyers 2 x Acclamator 2 x Tartan's and Vader Kalast used a tractor beam, so I had all ships concentrate their fire power on that hard point to take it out. A few minutes later I had won. A few notes here, that I have found out. (these are my own observations and could be wrong so please don't take this as the definitive "How To") I have repeated this mission using different tactics on several occasions. I couldn't build an Interdicter, as I need an overall technology rating of 4, not just space station level 4 You have to have auto resolve OFF in order to achieve this mission. Kalast will hyperspace away the first time you attack him (as you don't have the Interdicter yet) and you will have shed loads of Corellian Corvettes to deal with and a few Marauder Missile Cruisers to deal with. (tip have a huge fleet and loads of Acclamators and Victory Class ships to deal with them) You have to destroy every last one in order to be victorious. In order to reduce the size of the rebel fleet, I found it best to pull ALL my forces out from the neighbouring planets around Atzerri. The rebels WILL take over them, at the same time splitting their fleet. Giving you less to defeat on Atzerri. Auto Resolve MUST BE OFF for the first time you attack Kalast, and the subsequent time (s) you attack him (once you have been given your Interdicter) If he does hyperspace away, you will get a message informing you as to what planet he is on after a couple of minutes. After I defeated him, I went back and reclaimed the planets back from the Rebels, and rebuilt my fleet. In hindsight simple really.................LOL Well I hope this helps if anyone else ends up in the same situation as I found myself in. Regards....Master-Illusionist