Forsaken Turtles

"As we killed our opponents in the ring, we saw in their deaths the realization that they were individuals. And so we knew we were too. In killing, we understood life. In being the most disposable of commodities—a gladiator whose remains are thrown into the junkpile to be picked over and scavenged, the healthy pieces sold off to brokers in Iacon and Crystal City—in being disposable, we discovered we had value."

—Megatron remembers how it all began.
Transformers: Exodus.