The Blast. 1939. Stars Bela Lugosi, Robert Kent & Dorothy Arnold. Dr Zorka makes use of his ability to turn himself invisible to extract himself from a dangerous situation. [S]
Phantom Footprints. 1939. Stars Bela Lugosi, Robert Kent & Dorothy Arnold. Circumstances change, leading to Dr Zorka and West to hunt down the spies themselves. [S]
Trapped in the Flames. 1939. Stars Bela Lugosi, Regis Toomey & Robert Kent. Dr Zorka's enemies are in trouble, as he plans to turn his giant robot against them. [S]
Invisible Terror. 1939. Stars Bela Lugosi, Robert Kent & Edwin Stanley. Mallory makes a discovery about the source of Dr Zorka's power, creating trouble for the doctor. [S]
Death Stalks the Highways. 1939. Stars Bela Lugosi, Robert Kent & Dorothy Arnold. Dr Zorka swears to take revenge against society having discovered new forces to create weapons from. [S]
The Menacing Power. 1939. Stars Bela Lugosi, Robert Kent & Dorothy Arnold. Rogue scientist Dr Zorka attempts to rule the world with his sophisticated inventions. [S]
Death Stalks the Highways. 1939. Stars Bela Lugosi, Robert Kent & Dorothy Arnold. Dr Zorka swears to take revenge against society having discovered new forces to create weapons from.