I think it was Michaela who killed Rebecca, because she was driven over the edge by what had happened and blamed Rebecca, so she killed her.
The headache was likely caused by him not drinking caffeine, since a headache is one of the most common symptoms of caffeine withdrawal. Dealing with his ex wives probably wasn't helping either.
They both were on JAG.
I don't think so. Jenny's was in 16 episodes, while Abby's is one of three characters to be in every episode (the others are Gibbs and Tony).
Which ones? The HYDRA getting into S.H.I.E.L.D. storyline is from Marvel Comics.
His son also played Chip in Season 3.
It improved towards the end of the first season, when they could do the story they wanted to do.
I'm referring to the character, not the actor.
She did make one previous appearance, but it was at the very end of the episode.
Sam was born in 1972, so he's 42.
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