Boston EMS 10 p.m., ABC
If a nice relaxing Saturday night at home sounds like the exact opposite of what you’re after, tonight begins another white-knuckled season of ABC’s no-frills docu-series on the heroes of Boston Emergency Services, who would probably love a relaxing Saturday night at home. This episode, a stabbing in the park and a potential jumper on the brink.
Killer Coach 8 p.m. Lifetime
This Lifetime movie starring Keesha Sharp, Javicia Leslie, and Tom Maden might be about a swim coach whose insecurity and anger make him a threat to his star athlete. It could also be about a really tricked-out train car. Or a murderous handbag. There’s really only one way to find out.
Saturday Night Live 11:30 p.m., NBC
Amy Schumer slays the crowd!
Austin City Limits 11 p.m. PBS
Cassandra Wilson burns the house down!
Sharknado 4: The 4th Awakens Sunday 8 p.m., Syfy
Ian Ziering chainsaws sharks.Michael Andor Brodeur can be reached at firstname.lastname@example.org. Follow him on Twitter @MBrodeur.