The MPU is on the case when a young hockey player goes missing during a fight with an opponent on the ice. Kemi is unexpectedly reunited with a face from the past; Nikki runs interference with Braun when Jason dives deeper into the car bombing murders in the all-new “Alexi” episode of Alert: Missing Persons Unit airing Tuesday, April 30 (9:00-10:00 PM ET/PT) on FOX. (ALE-208) (TV-14 L, V)