G-Men from Hell

When corrupt FBI agents Dean Crept and Mike Mattress die, they are sent to hell, though they believe it must be an error. They escape by stealing a magical crystal from Satan that sends them back to Earth. Determined to buy their way into heaven, the two perform good deeds despite their ignorance of morality. They set up a private investigation business, and Greydon Lake and his wife, Gloria, both hire them to investigate the other. They attempt to solve the mystery of their own murders and evade the police, led by Lt. Langdon and Det. Dalton, who suspect them of killing their informant Buster. Meanwhile, Weenie Man, a shady informant also sent to hell, tells Satan about their escape; Satan gives the G-Men two days to complete their investigations and return his magic crystal. Along the way, they become involved with the plots of a mad scientist, Dr. Boifford, who resurrects Buster, and a superhero by the name of Cheetah Man.