That's a healthy spark... in the wrong place!
Hard to tell what the root cause is without more information. Looks like new (non-resistor) plugs gapped to 1mm are in order, along with a set of plug wires.
If there is liquid oil pooling at the base of the plugs, the valve cover gasket may be leaking - in which case you'll need to replace those too. A small amount of oil residue on the threads is normal.