Knuckles the Echidna teaches deputy Wade Whipple the techniques of the Echidna warrior.

A new threat emerges on board as Sam struggles to control the chaos unfolding around him.

Spotting an opportunity, Sam executes a plan to get a covert message to authorities on the ground.

Sam Nelson gets on a flight to London hoping to win back his ex-wife, but something on board feels wrong—and his suspicions are confirmed.