First appearance of Sram

Well actually Sram makes his first appearance at the end of Expect the Unexpected Part 2

Also a hand can be seen pushing Sergeant Major Zero out of Ninestine's chair.

Sram's thunderous roar is so powerful it can destroy mountains, so why can't it smash glass? In this episode he roars at Hawkwing but the glass window on Hawkwing and on Sram's spaceship don't break and later the windows on the Battlehawk don't smash when Sram roars at the mountain, the same thing also happens in Thunder Path when he hijacks the overlander his roar is so powerful it can smash anything except the windows on the overlander.

Well now that I have seen Thunder Path again
Sram does manage to smash the overlander windows as when you see Sram driving you can see broken glass all over the controls.

I can't understand why his roar can bring the cave down but not deafen Ninestein.

Hmm. I wonder why Sram never speaks again.

Why does the ZEAF fly to Earth with its landing gear down?

I think you'll find that glass was every were as he probably used to window to get into the overlander oposed to having to get the door open?