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Kryptonite

Robin uses Kryptonite.

Kryptonite is a glowing green mineral that emits a potent radiation that weakens Kryptonians in its vicinity. Batman keeps it in an "overwhelmingly impenetrable" vault in the Batcave. Robin used it to incapacitate the mind-controlled Superman at the Watchtower. It appeared to affect Superboy, who was restraining Superman, to a lesser extent.[1]

Sightings

References

  1. Weisman, Greg (writer) & Chang, Michael, Montgomery, Lauren (directors) (April 21, 2012). "Auld Acquaintance". Young Justice. Season 1. Episode 26. Cartoon Network.