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 powerful 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.
The Clank Zapper fires electricity at enemies within a range of Ratchet, dealing decent damage if infrequently and being useful defensively, as a supplement to Ratchet's weaponry. However, by the time the Clank Zapper is available, the player likely has access to Kilonoids and the Megaturret Glove, which fill the same defensive role, and are upgraded to Mega weapons for far less. The Clank Zapper is merely overkill at this point, as the player will have greater firepower from other weaponry already, meaning they may not even need a defensive weapon. 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 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.
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.