The Spirit Cannon (生か死か!?最後の手段 Sei ka Shi ka!? Saigo no Shudan) is the seventeenth episode of the Tien Shinhan Saga and the one hundredth episode in the Dragon Ball series. The episode first aired on February 10, 1988. In the original American episode title, "Cannon" was spelled "Canon".
With four arms, Tien Shinhan clearly has an advantage over Goku. He nearly pushes him out of the ring, forcing Goku to jump up. Tien grabs Goku's arms and legs and repeatedly headbutts him. Goku begins to smack Tien in the face with his tail, forcing Tien to let him go.
Goku then appears to grow six extra arms to counter Tien's four. The two of them continue fighting, until they simultaneously knock each other down. The count reaches eight before they both stand up. Goku trips Tien and grabs his legs in a submission hold. He pulls on his legs, causing Tien tremendous pain. Tien's extra arms reach up and choke Goku, but they quickly give up.
After a long struggle, Tien's legs flip Goku off of him and into the wall. Goku gets up, so Tien decides to use the Tri-Beam Cannon, a devastatingly powerful attack. Warning Goku, Tien floats high above the ring and fires the Tri-Beam on Goku. When the dust clears, the entire ring is gone, leaving a gaping hole in the ground. Goku is nowhere to be found.