A 30-episode run of the hospital drama series kicks off with the first in a two-part story which concludes tomorrow at 8pm.
Sam fights for his life after a struggle with a violent man, and Tina learns the extent of Sean's betrayal.
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[Photo caption] Guilt-edged bond: Chloe (Jan Anderson), Tina (Claire Goose) and Sean (Gerald Kyd) are sorely tried in Casualty

Casualty 8.05pm BBC1
The Holby City hospital crew are back with a heart-stoppingly good two-parter, which opens with staff nurse Sam Colloby lying in a pool of blood on the floor - remember that when the last series ended in March, he was plunging backward over the balcony railings on to the crowded casualty reception below. The serious head injuries he sustains devastate his friends and colleagues and it is this storyline that dominates the programme.
That's not to say there aren't several other equally gripping stories going on, including the one about Sean, Chloe and Tina; their friendship is severely strained -not surprisingly - since Tina found out that best mate Chloe was pregnant by Tina's lover Sean. There's also an almost incidental accident that will have a huge effect on the next episode, which airs tomorrow.