I missed that Episode, How did Armada Starscream die?

If I remember correctly he interfered into a battle between Optimus Prime and Galvatron and was shot down by Unicron I believe? I'm pretty sure that's what happened.

He fires his null cannon up at Unicron from the surface of Cybertron, Unicron responds and blasts him to dust before his blast makes it half to Unicron.

He fires his null cannon up at Unicron from the surface of Cybertron, Unicron responds and blasts him to dust before his blast makes it half to Unicron.

technically yeah it was unicron that dusted him. however with the injury that galvatron inflicted on him i think starscream was using every little bit of energy (even his spark energy) to put into that one final blast. so in all honesty he was already a goner.

Unicron blasted the fudiddlyuck out of him after Megatron pushed his sword through Starscream's chest.

Man, I gotta see the Unicron Battles! The screen caps I have seen look cool.

my avatar i made shows him doing that shows him blasting at unicron

He got in a sword fight with Galvatron and basically kicked Galvy's ass...even tho Galvy had the starsaber, Starscream still ran all over him...then at the final blow, he just let Galvatron run him through until his spark was showing...It was a statement that he meant business. If Galvatron didn't listen to Prime and join forces, they were all doomed. As his final move, he shakenly stood up and powerlinked Swindle, then blasted his null cannons at Unicron. Right before they could hit Unicron, Unicron blasted back and vaporized him, leaving a huge crater in the ground next to his wingsword and minicon.

When are the Armada repeats on now? Are they still in the Energon timeslot?

Yup. 6 AM I do believe.