Prototype SPX-4

After the great failures of the prototypes 1, 2 and 3, Dr. Schweitzer hasn't given up. Finally, after many months of hard labour and sleepless nights, the professor has found a way to make his Prototype SPX-4 work. Hope it doesn't explode this time...

"Great work dude. Exellent pick on the minifig head too."
- L-Space