Terran v Zerg: Marauder Hellion All-In

This is a very powerful all-in strategy which makes use of the high damage of marauders against buildings, queens and defensive roaches as well as the power of hellions against zerglings and drones. When orchestrated correctly this build produces a crippling attack which when unprepared for usually wins outright or does substantial damage.

0 – Supply Depot
12 – Barracks
13 – Refinery
16 – Marine
17 – Orbital command upgrade
17 – Barracks
17 – Supply depot
17 – SCV
18 – Marine
19 – SCV
20 – Factory
20 – Reactor on barracks

Pull one SCV from the refinery

20 – Tech lab on barracks
20 – SCV
21 – Supply depot
Swap Reactor from barracks to factory
23 – Marauder
25 – SCV x2
27 – Hellions x2
31 – Supply depot
31 – Tech lab on barracks
32 – SCV 33 – Hellions x2

Pull another SCV from the refinery

37 – Marauder
39 – Marauder
41 – Last SCV
42 – Hellions x2
46 – Supply Drop
46 – Marauders x2
50 – Supply Depot

From here you can constantly produce units rallying to the front line. If the attack fails you should have done enough damage to cripple your opponent. You should be wary of early mutalisks as well as baneling attacks following a failed attack. You can try to fortify a second command center at your natural, particularly if you have extra minerals during the assault for a backup plan. You can continue to make marauders and hellions for a second attack or switch to a more conventional unit composition.