by Jim Blimey
Your only defence is the ability to electrify the wires which kills the Sparx on them.
Sparx was originally a Sinclair BASIC type in game published in Sinclair User back in 1984, written by Jonathan Currey. I have taken this old code ported it over to ZXBASIC, spruced up the visuals and introduced different difficulty levels and joystick controls.
Download, here