The Clank Zapper is a weapon manufactured by Megacorp in Going Commando. It is an enhancement for Clank that, once selected, allows Clank to release a bolt of green electric energy from his antenna at enemies within a range of Ratchet.
The Clank Zapper can be purchased upon reaching challenge mode for 1,000,000 bolts from any Megacorp vendor. It can be upgraded to the Clank Shocker with use, which would also emit a red laser beam from Clank's eyes at enemies behind Ratchet. Despite being upgradeable, it is also the only weapon next to the Sheepinator that has no corresponding Mega upgrade.
The Clank Zapper fires electricity at enemies within a range of Ratchet, dealing decent but apparently random, damage and at an equally seemingly random rate of fire. It serves the same purpose as the Kilonoids, Megaturret Glove and Tesla Barrier, which fill the same defensive and support roles, and are upgraded to Mega weapons for far less. Another weakness of the weapon is that it is not obvious when the weapon's ammo has been used up and needs to be reapplied.
The Clank Shocker emits powerful red laser beams, that set enemies on fire, from Clank's eyes to enemies behind Ratchet, making it an all-around better weapon. This upgrade is more useful than the Zapper, but much like the Zapper, becomes redundant when the player likely has more powerful weaponry, yet can still prove additionally helpful for simply being extra damage output that functions on its own.
Behind the scenes
In the PlayStation Vita version of Ratchet & Clank: Going Commando, the Clank Zapper and Shocker would fire at enemies, but the particle effects were missing, and the enemies would take damage seemingly out nowhere. Clank's eyes and antenna still glowed, however.