Science is good.
The Story So Far
Batman gets to the Batcave in time to neutralize whatever weapon was used against him last issue. In do so he discovers a way to defeat Mr. Toxic. Mr. Toxic and the original Hugh Marder force Dr. Manhart to use the particle accelerator to help undo what their previous experiments did to Marder. This will either work or potentially destroy Gotham. Batman shows up and uses his antidote and saves Marder's life.
Backup Story: Bullock messes with a rookie who is assigned to watch the Joker's face and we get a little, tiny, itty-bitty taste of the upcoming Joker coming up in Batman #13.
Hit
The art is great as usual. The Mr. Toxic story line ends.
The backup story is fantastic. It is the absolute prefect teaser for the upcoming Joker story in Batman. It doesn't tell you anything about the story, but it totally puts you in the mode for a Joker story.
Miss
All this sketchy science is this arc is really lame. Batman does have some sci-fi like villains, but I feel that this guy was just too much. Way too much explaining. This is Detective Comics, how about some real detective work? I like Tony Daniels, but I will be glad to see someone else take the reigns.
Your Job
The only reason this issue makes it to 2.5 stars is because the art is still good and the back story is great. If there is way for you to not spend $4 on this while still being about to read the back story, I say do that. Otherwise this one should be a skip.