Great episode except for Starscream. I coldn't stand begging and the screaming (its in his name, I know...) combined with his really thin design I just can't stand this Starscream. Animated Starscream wasn't that annoying. Maybe because he had the proper Lattatude.
Well, Animated Megatron "killed" Animated Starscream instead of threatening him like Prime Megatron did with Prime Starscream. And from that point on, Starscream was immortal, so why bother being afraid? Animated Starscream was never quite in the same position as Prime Starscream.
And I loved the progression of Starscream's cowardice in this episode. Throughout the whole series has been rather brave and bold when it came to his actions. But we start to see that slip when he realizes why they're at the cave. Not just because of his Energon stockpile. That line of Starscream's; "Alone." was key to the whole slide of the Decepticon's confidence. He knew exactly why they were going down in a cave together alone and with no way to communicate with the other Decepticons. But his fear of Megatron propelled him forward. And the further they went into the cave, the more afraid he became until the fear absolutely broke him.
Very much a refreshing bit of characterization in the show. It wasn't just a reinforcing of an existing character trait like most of the characterization has been so far, but it took everything about the character we know about Starscream and flipped it on its head. Because up until this point, even when Starscream was groveling to Megatron, it was always fake. There was always a level of self-confidence behind those lines of dialog; it made it appear as though he no real fear of Megatron, he was merely buying time until he could enact his plans. But this time we saw just how genuinely afraid of Megatron he really is. Just him being alone with Megatron in the center of a dark cave just completely shattered Starscream's confidence and we saw his cowardice and fear laid bare.
And when he escaped from the cave, he tried to return to the (false) sense of bravado that he had previously possessed, but he couldn't. His fear drove him back into the cave to save the very robot that terrified him the most.
All and all, it did not only a great job of providing a character twist for Starscream, but also helped make Megatron that much more of a bad-ass. Even though he didn't really do anything in the episode (other than stupidly cause the cave-in), he gained so much more character from just standing there and making Starscream cry like a little girl.