The Robinson children are forced to come to terms with the fates of their father (TOBY STEPHENS) and Don (IGNACIO SERRICCHIO). Will (MAXWELL JENKINS) and Penny (MINA SUNDWALL) seek out an unconventional energy alternative that could power the remaining Jupiters to launch into space, and Judy sets out to find Maureen (MOLLY PARKER) who has been taken captive by Smith (PARKER POSEY). But Smith won't let her go easily.