Crossovers
- None recorded

Cameos/References
- PvP Online - Besides keeping up on politics and superheroes, Herschel has also been reading up on PvP! 28-09-2007
- PvP Online - Good thing you have a PvP-comic at hand when you have to demonstrate Dilatant Compound! 30-04-2008
- PvP Online - Aah, how cute the little one is, having fallen asleep with his favourite Skull Plush-Toy! 06-11-2009
- Nodwick - On their rescue-mission back in time and space the heroes run across... Nodwick and "friends"?! 22-08-2012

PS238 cameos/references can be found in:
- Nowhere so far

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