Thons are a type of rock demon known to be loyal to the demon Tolay. They guard and patrol his keep. When Egon Spengler disintegrated into the Netherworld, he was held prisoner by the Thons. The other Ghostbusters and Heironymus rescued Egon, but had to get away quickly when Tolay ordered the Thons to attack. In the end, all four of the Ghostbusters made it home and Heironymus was given a Proton Pack, which he now supposedly uses to defend himself from Tolay and his minions.
- ↑ Heironymus (2009). The Real Ghostbusters - "Egon's Ghost" (1987) (DVD ts. 16:01-16:04). Time Life Entertainment. Heironymus says: "'Tis guarded by Thons. Rock demons."