"Brilliant really. Well not brilliant, confused, broken. My mind is a jumbled mess of two different memory sets and there's already a millennia of memories in there; can't have room for a second life, already had 12 full ones..." Troy glanced at John before shrugging, "These brains aren't meant for 13 memory sets after all. Still, I'm managing. Not sure what to do about it all though."
Pointing back to the TARDIS locator device he nodded quickly, "Anyway, yes right. So if we were able to get everyone together and think of that last dream, that last moment of time we saw the TARDIS. Then it's likely, since the TARDIS is the single most connective tissue here, that with this device, and our amplified talents of telepathy, we could theoretically call out to the TARDIS. The focus could create enough of a tremor to call her. Oh a TARDIS call! That's what we'll call it."
He then spun around and laughed, "And that's the hair clip! It's a piece of Clara, it'd amplify her memories. We'd need something of Rose's, mine, yours, Martha's, even Duncan's..."
Troy froze then and frowned, "I'm the last regeneration."
His mind completely derailed and he looked to John, "Where does he come in?"