Goosebumps Series 2000. The alien opened its mouth revealing four tusks and rows pointed teeth. A cap of green skin formed over its forehead, curved and hard like turtle shell. It spread its arms, raised them out at its sides and took a heavy, wet step toward me. I finally forced my trembling legs to move, I stumbled back. Are, are you friendly? I choked out in a tiny voice. Check out the next book in this series: #6 I am your Evil Twin 2000 Time the Scares!