The actor told TV Guide that fans can expect "tons of death" in the climactic episode, titled 'Family'.
"I know the deaths are a pretty big deal right now, but with how strong the cliffhangers are, I think people are going to be more in awe of what happens next, than in awe of who just died," he speculated.
Zylka also hinted that his character Jake will go on an "emotional rollercoaster" following the resurrection of his dead brother Nick (Louis Hunter).
"Typical Jake, he tries to cover up his real emotions," revealed the star. "I mean, what would you do if your dead brother came back?"
Zylka added that Nick, who is possessed by the demon Abaddon, will be more powerful than ever upon his return.
"Wherever he went, wherever death took him, he is a lot more powerful for a really, really cool reason," he teased.
The Secret Circle continues on Thursdays at 9/8c on The CW and on Wednesdays at 8pm on Sky Living in the UK. The season finale will air on May 10 in the US.