Kenner Canada released 31 of the 33 carded Super Powers figures in bilingual packaging featuring both English and French text to comply with bilingual packaging laws in the country. As such, Flash has been documented on the following bilingual card style:
It currently appears as though Kenner Canada did not release any of the twelve first series characters on 2nd series 23-Back cards, having reserved the 23-Back card style exclusively for the ten (not eleven since Kenner Canada did not release Steppenwolf in carded form) new characters debuting in Kenner Canada's 2nd series packaging, so a Kenner Canada 2nd series 23-Back Joker carded figure likely does not exist.
Children residing outside the US and Canada collected Super Powers action figures distributed by additional international companies. International carded Joker figures released by the following companies have been documented in carded form:
Lil Ledy produced and distributed 1st series Super Powers figures in Mexico. Carded Lili Ledy examples with the exception of Wonder Woman are extremely rare, however I have not documented Joker on the Lili Ledy packaging yet.