Commander Kruge (Christopher Lloyd)’s Timeline and Summary

Kruge's lover delivers the Genesis plans to him. He rewards her with a lovely murder. (How sweet.)
After seeing the data, the Klingon decides that it'll make the ultimate weapon for preserving his race. Not that the race is going anywhere…but he's a bad guy.
Kruge arrives at Genesis and attacks the Grissom.
His gunner accidentally destroys the ship, so Kruge purposefully destroys his gunner.
Wanting prisoners, Kruge beams down to Genesis to search for some, Pokemon Go-style.
He succeeds but is called up to the ship with the arrival of Enterprise.
Kruge manages to battle the starship to a tie. He demands Kirk's surrender. To show he has the upper hand, he has one of the hostages, David, killed.
After Kruge's crew is killed on the Enterprise, he stays on the Bird-of-Prey until Kirk calls him for a ride home.
The Klingon commander beams down to the planet and fights Kirk for survival and for Genesis.
He loses and his life ends in a pit of lava—a death any true villain should be proud of.