Which episode was it?

Hi...all I need is some help in knowing which episode of Superboy was the one where Superboy fights this knight like demon who ends up transferring his soul into smoke into that girl who is Superboy's friend and she is sent to the hospital because she unfortunately ended up in the middle of the battle and she got knocked out. Once she wakes up, she's possessed by the spirit of that knight demon that had his soul in smoke transferred into her body, and then you see Superboy in a scene where he talks to this voice and there's like some kind of fire and brimstone around and you see the Earth right there in front of him. To give a little bit of an extra clue, when the girl wakes up and she's possessed, she tears Superboy's shirt. If anyone can help me on this one, it would be much appreciated. Thankyou.