8. The original live-action Flash
The Flash made his live-action debut all the way back in the 1979 Legends of the Superheroes TV specials for NBC, portrayed by Rod Hasse. The specials weren't exactly cutting edge even for their time and were mostly played for laughs, with the only really notable thing about them being that Adam West and Burt Ward reprised their legendary roles as Batman and Robin from the classic 1966 Batman TV series.
As for The Flash, he didn't have much to do at all. Like, at all. He did a bit of running (or blipping from one spot to another) and was a potential husband for Aunt Minerva when she was interested in marrying one of the heroes, only for her to reject him. That's it; that's the height of what the specials had for the Scarlet Speedster.
We'll never know the full extent of the original live-action Flash's powers because they were rarely showcased in the Legends of the Superheroes special, but it's safe to say that he's not quite as powerful - or as fast as some of his modern day counterparts. With that in mind, he unfortunately has to come bottom of our list.