|Episode(s)|| 2.12 Nightshifter|
4.02 Are You There God? It's Me, Dean Winchester (vengeful spirit)
He's got the laser eyes!
– Ronald Reznick, 2.12 Nightshifter
Ronald Resnick is a bank employee who witnessed a robbery committed by a co-worker Juan. Ronald is convinced however that it was not the real Juan who committed the crime. Ronald researches a string of related robberies, and concludes that they are committed by Mandroids.
Ronald works out where the next robbery will take place, as do Sam and Dean. Ronald takes everyone in the bank hostage, and then works with the boys to uncover the shapeshifter. Ronald is killed by a SWAT sniper.
Lilith casts a spell that breaks the first seal that holds Lucifer captive and releases the Witnesses - ghosts who died as a result of the supernatural, and return and kill those who let them die. Ronald returns and confronts Dean. He is vanquished when Bobby completes his spell.