A Magnum P.I. reboot is in the works at CBS Magnum P.I. is getting a reboot at CBS, according to THR. Peter Lenkov and Eric Guggenheim (reboots of Hawaii Five-0 and MacGyver) will reportedly write the script for the show, which has been given a pilot production commitment. (Lenkov is the showrunner for both shows.) The Magnum P.I. reboot will be executive produced by John Davis and John Fox (The Blacklist) through their David Entertainment banner.