They steal the research that Professor Mannfeldt had entrusted to Helius , and also burgle Helius 's home , taking other valuable material .
On his way home from his meeting with Professor Mannfeldt , Helius is mugged by henchmen of the gang of evil businessmen .
henchmen steal the research that Professor Mannfeldt Professor Mannfeldt had entrusted to Helius , and also burgle Helius 's home , taking other valuable material .
On his way home from his meeting with Professor Mannfeldt , Helius is mugged by henchmen of the gang of evil businessmen .