DC's Legends of Tomorrow

Two episodes in, and the show is already proving that it knows when to slow down and expound on plot rather than brush over it on the trip to the next action sequence.

In actual practice, Hunter’s invitation necessitates a great deal of discussion and debate. ... But once said conversations have been had, after the i’s are dotted and t’s crossed, the times ahead promise to be spread across the ages and a whole lotta fun.

Action is nicely balanced with sense of humor, and characters (most of whom have been seen in other contexts, including "Arrow" and "The Flash") are developed well from the beginning.

Familiar though they may be, that’s still a lot of characters to reintroduce while also establishing a premise that is sort of a Doctor Who meets Guardians of the Galaxy--with a touch of The Mummy Returns thrown in for good measure. But the show carries it off, setting up its time-travel parameters (they can change events, but not ones in which they’ve participated) as well as its hero/villain conflict.