At the end of "Castle" Season 6 Episode 1, "Valkyrie," a shocked Rick Castle (Nathan Fillion) gets to know from his fiance Kate Beckett (Stana Katic) that he has been exposed to a toxic chemical and that, he has only 24 hours to live.

In the first sneak peek of Castle Season 6 Episode 2, "Dreamworld," it is revealed that the men who stole the chemical have also stolen the antidote. The fresh batch cannot be made within 24 hours and Castle has only 24 hours to live.

The second sneak peek of "Dreamworld" shows Martha (Susan Sullivan), Castle's mother, calling-up Castle to know what is happening and why was he taken away by the Feds. Alexis (Molly Quinn) asks if he is under- arrest and if they need to bail him out.

In the new sneak peek, Castle could be heard making an excuse that he has some special knowledge about a case and that is why he was escorted out by Beckett. An emotional Castle, keeping his composure intact, tells his mother thank you. Castle tells his daughter: "Hopefully, I'll be back tomorrow morning. And ... you know that I love you, right."

In the first sneak peek, "Antidote," Beckett says to Castle: "I'm not going to let you off our engagement, that easily" and that they are going find the antidote soon. Castle and Beckett work better as a team. It is likely that Castle will join the Feds to find the culprits and get his shot, and get to live 100 more fictional years. A sombre Castle is not an entertaining sight and hopefully, he is back to cracking jokes and fiddling with Beckett's cases.

"Beckett races to find a stolen toxin capable of killing thousands of people; Castle has less than 24 hours to live after being exposed to the chemical weapon," according to ABC's synopsis for Episode 2, "Dreamworld," of "Castle" Season 6.

Sneak Peak 2 : "Castle" Season 6: "Dreamworld"

[Source: Youtube.com/becklebee9nfsk3]