The path to the big time...

So, you want Doom's eh? Then follow the yellow brick road my fine fellows......

1. Build Research Center level
2. Build Shipyard level
3. Research "Exploration of Space" http://eu2opia.wikia.com/wiki/Probe

4. Research "Engine Techniques " http://eu2opia.wikia.com/wiki/Standard_Engine

5. Build Research Center level 2

6. Research "Space Hunter" http://eu2opia.wikia.com/wiki/Lancer

7. Research "Coherent Resonators" http://eu2opia.wikia.com/wiki/Wincom

8. Research "Advanced Hunter" http://eu2opia.wikia.com/wiki/Cutter

9. Research "Structural Integrity " http://eu2opia.wikia.com/wiki/Corvette

10.Build Research Center level 3

11.Research "Modular design" http://eu2opia.wikia.com/wiki/Frigate

12.Research "Simple impulse drive" http://eu2opia.wikia.com/wiki/GMT-1

13.Research "Bundling of Impulse" http://eu2opia.wikia.com/wiki/GMT-2

14.Build Research Center level 4

15.Research "Impulse Booster " http://eu2opia.wikia.com/wiki/GMT-3

16.Research "Great warship " http://eu2opia.wikia.com/wiki/Destroyer

17.Build Research Center level 5

18.Research " Reconnaissance ship " http://eu2opia.wikia.com/wiki/Cruiser

19.Research "System Defence" http://eu2opia.wikia.com/wiki/Nighthawk

NB: Step 19 "System Defence" can be researched after Doombringer

20.Research “Armour” http://eu2opia.wikia.com/wiki/Standard_Armour

21.Research "Better Heat Protection" http://eu2opia.wikia.com/wiki/ATS

22.Research "Metal Concentration" http://eu2opia.wikia.com/wiki/ATSM

23.Build Research Center Level 6

24.Research "Improved Reconnaissance Ship" http://eu2opia.wikia.com/wiki/Medium_Cruiser

25.Research "Cluster Alloy" http://eu2opia.wikia.com/wiki/DATS

26.Research "Stronger Reconnaissance Ship" http://eu2opia.wikia.com/wiki/Battle_Cruiser

27.Research "Battleship" http://eu2opia.wikia.com/wiki/Battleship

28.Build Research Center Level 7

29.Research "New BattleShip" http://eu2opia.wikia.com/wiki/Dreadnought

30.Research "Enhanced Dreadnought" http://eu2opia.wikia.com/wiki/Dreadnought_Super_Large

31.Research "New Battleship" http://eu2opia.wikia.com/wiki/Titan

32.Research "Hardened Armour" http://eu2opia.wikia.com/wiki/Silt

33.Build Research Center Level 8

34.Research "Hardened Armour" http://eu2opia.wikia.com/wiki/NAA

35.Research "SLIT Enhancement" http://eu2opia.wikia.com/wiki/SLT

36.Research “Efficient Cooling” http://eu2opia.wikia.com/wiki/Small

37.Research “Laser Implusation” http://eu2opia.wikia.com/wiki/Medium

38.Research "Bundled Laserbeams" http://eu2opia.wikia.com/wiki/Blaster

39.Build Research Center Level 9

40.Research "Blaster Advancement" http://eu2opia.wikia.com/wiki/Blaster_EXT

41.Research "New BattleShip" http://eu2opia.wikia.com/wiki/Behemoth

42.Build Research Center Level 10

43.Research "Buran" http://eu2opia.wikia.com/wiki/Birel

44.Research "New Battleship" http://eu2opia.wikia.com/wiki/Leviathan

45.Research "Mach" http://eu2opia.wikia.com/wiki/Mach

46.Research "Bemoth" http://eu2opia.wikia.com/wiki/Aurel

47.Research "Bemoth 2" http://eu2opia.wikia.com/wiki/Trayan

48.Research "Mega Titan" http://eu2opia.wikia.com/wiki/Doombringer

NB. Point 45 "Mach" can be researched after Doombringer.