When Hollywood gets something right, it tends to do it again. We've seen many successful revivals and reboots, including "Doctor Who," "Gilmore Girls" and "Veronica Mars." But getting a reboot right requires a careful balance. Brand expert Evan Nierman, founder of Red Banyan PR, told Fox News Digital why studios like to revisit familiar stories and characters. "Stray too far from the original, and you risk angering or alienating legions of devoted fans.