The Most Underrated Dinosaur

The climax of TierZoo's Deinocheirus playthrough, which uses footage from "Amazing Dinoworld", involves a Tarbosaurus trying to attack a group of Deinocheirus players early in their playthrough just before they've leveled up enough to become self-sufficient. TierZoo as the adult Deinocheirus fights off the Tarbosaurus, but is mortally wounded in the fight and dies just after the other Deinocheirus players gain the necessary XP to level up from watching the fight. In-game, the lower level teammates are his character's offspring.

Example of:
Heroic Sacrifice