Surprise surprise, the snake named "Death Adder" is deadly. It is one of the most venomous snakes in its native Australia and New Guinea, as well as one of the most venomous snakes anywhere on Earth.
They also have one of the fastest strikes of any snake. Not a super great combination if you happen to run into one in the wild.
Dead Adders are ambush predators, meaning they lay in wait for their prey. If you get bit by one and you don't get medical attention, you can suffer respiratory failure and total paralysis within six hours. Thankfully, there is an antivenom. But if you don't get it in time, you may very well die.