If you're looking forward to the final episode of season one of Gotham, Fox, along with the cast and crew of the series, describe the finale as a mind-blowing experience.

Fox recently released two promotional videos teasing things to come in the big season finale, including a few things we already know about, but also teasing change and a lot of surprises.

"Your brain is going to explode from all the awesomeness," says Camren Bicondova, who plays a young Selina Kyle (aka the future Catwoman) on the series.

Cory Michael Smith, who plays Edward Nygma (aka the future Riddler) promises "a lot of change in power in the city." He also teases that "not everyone's going to survive."

We already know that one character won't return for season two: Fish Mooney (portrayed by Jada Pinkett-Smith). The actress already confirmed that she only signed up for one season and that her character goes with her. Does this mean the death of Fish or will she merely move on to greener pastures? We'll find out for sure next week.

However, in this video, Fish has returned to Gotham, complete with a new hairstyle, a worse attitude and that weird fake eye she got on the island where she was held prisoner.

In a second trailer, we also see Barbara showing off her bad girl side, something teased in last week's episode as she falls farther down the rabbit hole with the Ogre. Here, she's wielding a knife and it looks like she's targeting Jim Gordon's current girlfriend, Dr. Leslie Thompkins. That takes crazy ex to a whole new level.

The clip ends with the statement that "the last five minutes will unleash destiny" and shows us Oswald Cobblepot seemingly pushing Fish Mooney off a ledge and the secret of Bruce Wayne's father finally revealed: wait, is that the bat cave?

Here's the full synopsis for the episode, titled "All Happy Families Are Alike:"

As Gotham City's gang war reaches its boiling point, Fish Mooney goes head-to-head with Maroni and Penguin in an attempt to re-stake her claim on the city. Meanwhile, Barbara and Leslie Thompkins are brought together after recent events, and Bruce searches Wayne Manor for any hints that his father might have left behind.

The season finale of Gotham airs on Monday, May 4 on Fox.

[Photo Credit: Fox]

Be sure to follow T-Lounge on Twitter and visit our Facebook page.