(Daring Mystery Comics#4/5 (fb) - BTS) - Marvex's humanlike head was replaced with one of a much more streamlined, mechanical design.

(Daring Mystery Comics#4/5) - Marvex and Crandall discussed Crandall's friend Jim Hansen, who had been convicted of murder and sent to Death Row. Crandall was sure Hansen was innocent, but all the witnesses who could have helped clear his name had mysteriously vanished. As Marvex left Crandall's home, he came across a bank robbery, which he quickly foiled. The police came and took the robbers -- Spike Green and his gang -- prisoner. However, as Marvex left the scene of the crime, he was caught in a steel net by some of Green's other henchmen and dragged behind their car. The rough treatment temporarily deactivated Marvex, and he did not awaken until they had thrown him off a boat into the harbor. The shock of the cold brought Marvex around, and he freed himself, heading up to the boat. There, he overheard that Green was planning a jailbreak before Jim Hansen (in the same cell block) would be able to identify him as the real killer. Having heard all he needed, Marvex defeated all of the thugs on the boat and called the harbor police. He then commandeered their car and headed for the prison.
   Just as Marvex reached the warden's office and told him what he'd heard, Green started a riot in the mess hall, and he and a band of prisoners fought their way into the office. They managed to overpower Marvex through sheer numbers, carried him to the electric chair, and bound him in. Then they turned on the power and left. However, Marvex was impervious to electricity and broke free, beating the convicts to the prison gate. There he fought them long enough for the guards to recapture them, and personally caught Green, protecting him from the guards' bullets so that he could confess to the murder of which Hansen had been convicted.

(Daring Mystery Comics#5/5) - Marvex located and apprehended the members of Brad Lewis' east side mob who were planning a bank robbery. The newspaper coverage of the event prompted the roboticist Dr. Narr to prepare a trap for Marvex, so that he could study him. Narr sent Marvex a note which led the robot to the old hill tower, where he was trapped in a net and carried into the tower by several of Narr's robots. When they removed him from the net, however, Marvex quickly smashed them. Narr incapacitated him with a magnetic ray and placed him on a similarly-magnetic table, preparing to dismantle him. In desperation, Marvex contacted Crandall by radio, and she quickly tracked him to the hill tower, where she smashed Narr's control panel. This not only deactivated the magnetic table, but sent Narr's robots into an unguided destructive rampage. Marvex saved Narr from his own creations, then destroyed them. Enraged at the destruction of his robots, Narr tried to kill Marvex and Crandall, but accidentally fell to his death through one of the tower's high windows. The pair left shortly before the damaged tower collapsed in a fireball.
   The remnants of the east side mob, seeing the explosion at the old tower, assumed Marvex was dead and went to the docks to steal a shipment of gold. They killed the guards and boarded the ship, but Marvex arrived in a nick of time and stopped them. Shortly thereafter, Crandall arrived with the police, and Lewis and his mob were arrested.

Comments: Created by an unknown writer and artist (possibly Allen Simon).

Clara seems to be a good influence on Marvex. When he first arrives in our dimension, he goes out of his way to kill the criminals he encounters, as well as his own creators, but by his last appearance, he tries to save the life of Dr. Narr even though the doctor abducted and tried to dissect him.