Sektor stay mostly the same as in MK3, while gaining advantage of using combo started from the air combo.
Sektor is gifted special move that can be well combined together. He has his Straight Missile move that act as his projectile and flies fast toward his opponent. He can also do a Homing Missile that will try to follow his opponent in order to explode on him. His dangerous teleport punch is an excellent launcher that give Sektor a few seconds to enact his next strategy. 4 combos are in his arsenal. Two of them do significant damage and another one cause the opponent to be launched for combo possibilities.
Sektor can destroy any opponent controlled by the CPU. With good setup, he can use his Homing Missile once, wait for it to explode on his opponent and perform his Teleport Punch right away, causing a lot of damage in the process. He can combine his Homing Missile with his combo as well, since the CPU will often get caught in the process.
As a side note, Sektor can perform his Teleport Uppercut twice against Shao Khan, but not against any other character in the game. Having the same move, Smoke can do it as well. It is probably an oversight and not an intentional ability.
TAS tools were used to make this high quality playthrough video.