It is over! Optimus Prime has been defeated!
6 seconds sound clip from The Transformers (1984) - Heavy Metal War TV Series.
You can hear this line at 00:13:43 in the DVD version of the movie.
Quote context
[...]
- Yeah Way to go Prime! You're not down yet!
- You cannot blast what you cannot see. Nor what you cannot hear.
- Reflector and Thundercracker must be proud, or rather there power chip rectifiers must be.
- You were good, Optimus Prime. But not good enough to fight Megatron!
- It is over! Optimus Prime has been defeated!
- All Autobots must exile themselves to deeper space!
- No. I can't believe it. Optimus Prime, beaten by Megatron.
- He's still functional, but barely.
- My fault. Underestimated Megatron. Never suspected he had so many powers. I was not prepared.
[...]