...This is going to sound crazy, but... I'm starting to realize something. Every time Cell has been weakened, it's been because of something he ate. He's tried eating a couple people, had a bad reaction, and had to spit them out.
My blood is highly radioactive, and basically the only reason I'm alive is because of my super weird physiology. Cell doesn't have that, and if I can get enough of my blood in his body somehow, well...
I understand. Well, if you wanna help 'em, you really need to make sure you're ready for that.
-Is like [1]
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Look, I'm... sorry if I offended you, but I don't want to be your rival. There's just no- point in that.
-flings her arm dramatically, her coat billowing in the wind-
Don't you see? There can be no respite for those such as you and I... those people whose fates intertwine and unfold in tandem! Yes, I can see it now, Julie... Your destiny is to be — my strongest opponent yet!
UN JOUR JE SERAI DE RETOUR PRÈS DE TOI-Cell speaks outside the room, using ki to amplify his voice so it can be heard for miles-
"Attention, residents of...whatever the hell this place is! My name is Cell, and if you don't know me by now, congrats on your peaceful life! Anyway, I've come to a decision. Since so far, nobody has been able to offer the perfect being a good fight, I have an ultimatum for you all! Either bring me a good challenge within two weeks, or I'm leaving this place forever."
-Oh, that doesn't sound so-
"After I blow it up."

I don't think you really... implied it, either.