MacGyver Mac’s (Lucas Till) friend (guest star Aly Michalka), a scientist at MIT, fakes her death to stay alive when someone wants to make sure she doesn’t finish her research. Justin Hires and George Eads also star. 8 p.m. CBS
Grimm This fantasy-drama ends its six-season run as Nick (David Giuntoli) faces the one enemy he may be unable to defeat. Monroe, Rosalee and Eve (Silas Weir Mitchell, Bree Turner, Bitsie Tulloch) do what they can to help, and Diana (Hannah R. Loyd) and the baby are protected by Capt. Renard and Adalind (Sasha Roiz, Claire Coffee) in the series finale. 8 p.m. NBC
The Originals After...