The Jehovah's witnesses deny the resurrection of Christ by claiming that Jesus was not raised in a body, but only in spirit. This is contrary to the word of God.
In the video below, I also preach from the word of God that Christ is God (separate from the Father, but co-equal). Again, something in which the JWs deny.
The video was filmed in church, so it has traditional hymn singing beforehand, but the message itself is less than 30 minutes, titled "The importance of the resurrection".