That is one of the few episodes that I didn't see, but from what I've heard and read about it, this is what happens:
When Venus accidentally traps someone by a forcefield, they begin to question her value to the team, recounting her numerous mistakes in the past. Just when they decide that they'd be better off without her, they discover that she's been captured by the Rank! (This is from the official site, and it basically was just a clip show.)
I hope that helps.
