Joe: Wait—the what, now?
Barry: If you travel back in time to change something, then you end up being the causal factor of that event.
Cisco: Like . . . Terminator.
Joe: Ah!
Wells: Or is time plastic? Is it mutable, whereby any changes in the continuum could create an alternate timeline?
Cisco: Back to the Future.
Joe: Ah, saw that one, too.
The pilot gets one extra half star for playing The Captain and Tennille when the gang visits 1975 and another plus half star because the swollen-headed Rip got belted by both Hawkgirl and the White Canary; but it lost a half star for Rip’s own soppy background story. Beyond the pilot, though, the explanations about changes to the timeline are just whacked.