how to get rid of a virus that is on my phone

A

AC Question

I have a galaxy s3 every time I go to make a call, play a game, or pull up apps. I'm not going to lie but I downloaded porn on my phone and I'm pretty sure that's where I got it. Now a robot broke up in tiny pieces on a floor keeps popping up. I have uninstalled the porn site but the robot is still popping up. will any antivirus app work from the play store ?