I'll Play Batman: Level 3

After destroying the Axis Chemical factory, Batman falls into a trap (?) and is sent to the Underground Conduit.  Batman fights (and dies) his way through two screens of underground water pipes and a final ascent through a dragon tank-inhabited cavern.  As he emerges (heroically) on the surface, Batman must take down Electrocutioner.

Just how many volts are 10 Mega-Giga volts, again?